diff --git a/ghost/core/test/integration/services/email-service/__snapshots__/batch-sending.test.js.snap b/ghost/core/test/integration/services/email-service/__snapshots__/batch-sending.test.js.snap
index d7b0bb87d4b..54a586dc307 100644
--- a/ghost/core/test/integration/services/email-service/__snapshots__/batch-sending.test.js.snap
+++ b/ghost/core/test/integration/services/email-service/__snapshots__/batch-sending.test.js.snap
@@ -518,7 +518,7 @@ table.body h2 span {
                                 <td class=\\"wrapper\\" align=\\"center\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; font-size: 18px; vertical-align: top; color: #15212A; box-sizing: border-box;\\" valign=\\"top\\">
                                     <table role=\\"presentation\\" border=\\"0\\" cellpadding=\\"0\\" cellspacing=\\"0\\" width=\\"100%\\" style=\\"border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; padding-top: 40px; padding-bottom: 30px;\\">
                                         <tr>
-                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
+                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
                                         </tr>
 
                                             <tr>
@@ -656,7 +656,7 @@ Testing feature image caption
 
 
 
-Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid]
+Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid]
 
 
 
@@ -3133,7 +3133,7 @@ table.body h2 span {
                                 <td class=\\"wrapper\\" align=\\"center\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; font-size: 18px; vertical-align: top; color: #15212A; box-sizing: border-box;\\" valign=\\"top\\">
                                     <table role=\\"presentation\\" border=\\"0\\" cellpadding=\\"0\\" cellspacing=\\"0\\" width=\\"100%\\" style=\\"border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; padding-top: 40px; padding-bottom: 30px;\\">
                                         <tr>
-                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
+                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
                                         </tr>
 
                                             <tr>
@@ -3232,7 +3232,7 @@ Hello world
 
 
 
-Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid]
+Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid]
 
 
 
@@ -3762,7 +3762,7 @@ table.body h2 span {
                                 <td class=\\"wrapper\\" align=\\"center\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; font-size: 18px; vertical-align: top; color: #15212A; box-sizing: border-box;\\" valign=\\"top\\">
                                     <table role=\\"presentation\\" border=\\"0\\" cellpadding=\\"0\\" cellspacing=\\"0\\" width=\\"100%\\" style=\\"border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; padding-top: 40px; padding-bottom: 30px;\\">
                                         <tr>
-                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
+                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
                                         </tr>
 
                                             <tr>
@@ -3889,7 +3889,7 @@ Hello world
 
 
 
-Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid]
+Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid]
 
 
 
@@ -4417,11 +4417,11 @@ table.body h2 span {
                                         <table class=\\"feedback-buttons\\" role=\\"presentation\\" border=\\"0\\" cellpadding=\\"0\\" cellspacing=\\"0\\" style=\\"border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; margin: auto; width: auto;\\" width=\\"auto\\">
                                             <tr>
                                                     <td dir=\\"ltr\\" valign=\\"top\\" align=\\"center\\" style=\\"color: #15212A; display: inline-block; vertical-align: top; font-family: inherit; font-size: 14px; text-align: center; padding: 0 4px 4px; cursor: pointer;\\" nowrap>
-                                                        <a href=\\"http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/1/?uuid=member-uuid\\" target=\\"_blank\\" style=\\"color: #FF1A75; text-decoration: none; overflow-wrap: anywhere;\\">
+                                                        <a href=\\"http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/1/?uuid=member-uuid&amp;key=xxxxxx\\" target=\\"_blank\\" style=\\"color: #FF1A75; text-decoration: none; overflow-wrap: anywhere;\\">
                                                             <img src=\\"https://static.ghost.org/v5.0.0/images/more-like-this.png\\" border=\\"0\\" width=\\"145\\" height=\\"36\\" alt=\\"More like this\\" style=\\"border: none; -ms-interpolation-mode: bicubic; max-width: 100%;\\">
                                                         </a>
                                                     </td>                                                    <td dir=\\"ltr\\" valign=\\"top\\" align=\\"center\\" style=\\"color: #15212A; display: inline-block; vertical-align: top; font-family: inherit; font-size: 14px; text-align: center; padding: 0 4px 4px; cursor: pointer;\\" nowrap>
-                                                        <a href=\\"http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/0/?uuid=member-uuid\\" target=\\"_blank\\" style=\\"color: #FF1A75; text-decoration: none; overflow-wrap: anywhere;\\">
+                                                        <a href=\\"http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/0/?uuid=member-uuid&amp;key=xxxxxx\\" target=\\"_blank\\" style=\\"color: #FF1A75; text-decoration: none; overflow-wrap: anywhere;\\">
                                                             <img src=\\"https://static.ghost.org/v5.0.0/images/less-like-this.png\\" border=\\"0\\" width=\\"142\\" height=\\"36\\" alt=\\"Less like this\\" style=\\"border: none; -ms-interpolation-mode: bicubic; max-width: 100%;\\">
                                                         </a>
                                                     </td>                                                    <td dir=\\"ltr\\" valign=\\"top\\" align=\\"center\\" style=\\"color: #15212A; display: inline-block; vertical-align: top; font-family: inherit; font-size: 14px; text-align: center; padding: 0 4px 4px; cursor: pointer;\\" nowrap>
@@ -4433,12 +4433,12 @@ table.body h2 span {
                                         <table class=\\"feedback-buttons-mobile\\" role=\\"presentation\\" border=\\"0\\" cellpadding=\\"0\\" cellspacing=\\"0\\" style=\\"border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; display: none; mso-hide: all;\\" width=\\"100%\\">
                                             <tr>
                                                     <td dir=\\"ltr\\" valign=\\"top\\" align=\\"center\\" style=\\"color: #15212A; vertical-align: top; font-family: inherit; font-size: 14px; text-align: center; padding: 0 4px 4px; cursor: pointer; width: 33%;\\" nowrap width=\\"33%\\">
-                                                        <a href=\\"http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/1/?uuid=member-uuid\\" target=\\"_blank\\" style=\\"color: #FF1A75; text-decoration: none; overflow-wrap: anywhere;\\">
+                                                        <a href=\\"http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/1/?uuid=member-uuid&amp;key=xxxxxx\\" target=\\"_blank\\" style=\\"color: #FF1A75; text-decoration: none; overflow-wrap: anywhere;\\">
                                                             <img src=\\"https://static.ghost.org/v5.0.0/images/more-like-this-mobile.png\\" border=\\"0\\" width=\\"42\\" height=\\"42\\" alt=\\"More like this\\" style=\\"border: none; -ms-interpolation-mode: bicubic; max-width: 100%;\\">
                                                             <p class=\\"feedback-button-mobile-text\\" style=\\"margin: 0 0 1.5em 0; line-height: 1.6em; color: #15212A; font-weight: 500; margin-bottom: 0; font-size: 13px;\\">More like this</p>
                                                         </a>
                                                     </td>                                                    <td dir=\\"ltr\\" valign=\\"top\\" align=\\"center\\" style=\\"color: #15212A; vertical-align: top; font-family: inherit; font-size: 14px; text-align: center; padding: 0 4px 4px; cursor: pointer; width: 33%;\\" nowrap width=\\"33%\\">
-                                                        <a href=\\"http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/0/?uuid=member-uuid\\" target=\\"_blank\\" style=\\"color: #FF1A75; text-decoration: none; overflow-wrap: anywhere;\\">
+                                                        <a href=\\"http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/0/?uuid=member-uuid&amp;key=xxxxxx\\" target=\\"_blank\\" style=\\"color: #FF1A75; text-decoration: none; overflow-wrap: anywhere;\\">
                                                             <img src=\\"https://static.ghost.org/v5.0.0/images/less-like-this-mobile.png\\" border=\\"0\\" width=\\"42\\" height=\\"42\\" alt=\\"Less like this\\" style=\\"border: none; -ms-interpolation-mode: bicubic; max-width: 100%;\\">
                                                             <p class=\\"feedback-button-mobile-text\\" style=\\"margin: 0 0 1.5em 0; line-height: 1.6em; color: #15212A; font-weight: 500; margin-bottom: 0; font-size: 13px;\\">Less like this</p>
                                                         </a>
@@ -4458,7 +4458,7 @@ table.body h2 span {
                                 <td class=\\"wrapper\\" align=\\"center\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; font-size: 18px; vertical-align: top; color: #15212A; box-sizing: border-box;\\" valign=\\"top\\">
                                     <table role=\\"presentation\\" border=\\"0\\" cellpadding=\\"0\\" cellspacing=\\"0\\" width=\\"100%\\" style=\\"border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; padding-top: 40px; padding-bottom: 30px;\\">
                                         <tr>
-                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
+                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
                                         </tr>
 
                                             <tr>
@@ -4585,11 +4585,11 @@ Hello world
 
 
 
-http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/1/?uuid=member-uuid
+http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/1/?uuid=member-uuid&key=xxxxxx
 
 
 
-http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/0/?uuid=member-uuid
+http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/0/?uuid=member-uuid&key=xxxxxx
 
 
 
@@ -4608,7 +4608,7 @@ http://127.0.0.1:2369/this-is-a-test-post-title-4/#ghost-comments
 More like this
 
 
-[http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/1/?uuid=member-uuid]
+[http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/1/?uuid=member-uuid&key=xxxxxx]
 
 
 
@@ -4617,7 +4617,7 @@ More like this
 Less like this
 
 
-[http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/0/?uuid=member-uuid]
+[http://127.0.0.1:2369/this-is-a-test-post-title-4/#/feedback/post-id/0/?uuid=member-uuid&key=xxxxxx]
 
 
 
@@ -4640,7 +4640,7 @@ Comment
 
 
 
-Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid]
+Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid]
 
 
 
@@ -7300,7 +7300,7 @@ table.body h2 span {
                                 <td class=\\"wrapper\\" align=\\"center\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; font-size: 18px; vertical-align: top; color: #15212A; box-sizing: border-box;\\" valign=\\"top\\">
                                     <table role=\\"presentation\\" border=\\"0\\" cellpadding=\\"0\\" cellspacing=\\"0\\" width=\\"100%\\" style=\\"border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; padding-top: 40px; padding-bottom: 30px;\\">
                                         <tr>
-                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
+                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
                                         </tr>
 
                                             <tr>
@@ -7513,7 +7513,7 @@ Hello world [http://127.0.0.1:2369/r/xxxxxx?m=member-uuid]
 
 
 
-Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid]
+Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid]
 
 
 
@@ -11603,7 +11603,7 @@ table.body h2 span {
                                 <td class=\\"wrapper\\" align=\\"center\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; font-size: 18px; vertical-align: top; color: #15212A; box-sizing: border-box;\\" valign=\\"top\\">
                                     <table role=\\"presentation\\" border=\\"0\\" cellpadding=\\"0\\" cellspacing=\\"0\\" width=\\"100%\\" style=\\"border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; padding-top: 40px; padding-bottom: 30px;\\">
                                         <tr>
-                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
+                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
                                         </tr>
 
                                             <tr>
@@ -11732,7 +11732,7 @@ Hey Simon, Hey Simon,
 
 
 
-Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid]
+Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid]
 
 
 
@@ -12262,7 +12262,7 @@ table.body h2 span {
                                 <td class=\\"wrapper\\" align=\\"center\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; font-size: 18px; vertical-align: top; color: #15212A; box-sizing: border-box;\\" valign=\\"top\\">
                                     <table role=\\"presentation\\" border=\\"0\\" cellpadding=\\"0\\" cellspacing=\\"0\\" width=\\"100%\\" style=\\"border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; padding-top: 40px; padding-bottom: 30px;\\">
                                         <tr>
-                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
+                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
                                         </tr>
 
                                             <tr>
@@ -12391,7 +12391,7 @@ Hey there, Hey ,
 
 
 
-Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid]
+Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid]
 
 
 
diff --git a/ghost/core/test/integration/services/email-service/__snapshots__/cards.test.js.snap b/ghost/core/test/integration/services/email-service/__snapshots__/cards.test.js.snap
index 403143a56fe..ee9905ebf06 100644
--- a/ghost/core/test/integration/services/email-service/__snapshots__/cards.test.js.snap
+++ b/ghost/core/test/integration/services/email-service/__snapshots__/cards.test.js.snap
@@ -505,7 +505,7 @@ table.body h2 span {
                                 <td class=\\"wrapper\\" align=\\"center\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; font-size: 18px; vertical-align: top; color: #15212A; box-sizing: border-box;\\" valign=\\"top\\">
                                     <table role=\\"presentation\\" border=\\"0\\" cellpadding=\\"0\\" cellspacing=\\"0\\" width=\\"100%\\" style=\\"border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; padding-top: 40px; padding-bottom: 30px;\\">
                                         <tr>
-                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
+                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
                                         </tr>
 
                                             <tr>
@@ -632,7 +632,7 @@ This is a paragraph test.
 
 
 
-Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid]
+Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid]
 
 
 
@@ -1162,7 +1162,7 @@ table.body h2 span {
                                 <td class=\\"wrapper\\" align=\\"center\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; font-size: 18px; vertical-align: top; color: #15212A; box-sizing: border-box;\\" valign=\\"top\\">
                                     <table role=\\"presentation\\" border=\\"0\\" cellpadding=\\"0\\" cellspacing=\\"0\\" width=\\"100%\\" style=\\"border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; padding-top: 40px; padding-bottom: 30px;\\">
                                         <tr>
-                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
+                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
                                         </tr>
 
                                             <tr>
@@ -1289,7 +1289,7 @@ This is a paragraph
 
 
 
-Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid]
+Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid]
 
 
 
@@ -2083,7 +2083,7 @@ Ghost: Independent technology for modern publishingBeautiful, modern publishing
                                 <td class=\\"wrapper\\" align=\\"center\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; font-size: 18px; vertical-align: top; color: #15212A; box-sizing: border-box;\\" valign=\\"top\\">
                                     <table role=\\"presentation\\" border=\\"0\\" cellpadding=\\"0\\" cellspacing=\\"0\\" width=\\"100%\\" style=\\"border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; padding-top: 40px; padding-bottom: 30px;\\">
                                         <tr>
-                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
+                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
                                         </tr>
 
                                             <tr>
@@ -2481,7 +2481,7 @@ http://127.0.0.1:2369/r/xxxxxx?m=member-uuid
 
 
 
-Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid]
+Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid]
 
 
 
@@ -3275,7 +3275,7 @@ Ghost: Independent technology for modern publishingBeautiful, modern publishing
                                 <td class=\\"wrapper\\" align=\\"center\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; font-size: 18px; vertical-align: top; color: #15212A; box-sizing: border-box;\\" valign=\\"top\\">
                                     <table role=\\"presentation\\" border=\\"0\\" cellpadding=\\"0\\" cellspacing=\\"0\\" width=\\"100%\\" style=\\"border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; padding-top: 40px; padding-bottom: 30px;\\">
                                         <tr>
-                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
+                                            <td class=\\"footer\\" style=\\"font-family: -apple-system, BlinkMacSystemFont, &#39;Segoe UI&#39;, Roboto, Helvetica, Arial, sans-serif, &#39;Apple Color Emoji&#39;, &#39;Segoe UI Emoji&#39;, &#39;Segoe UI Symbol&#39;; vertical-align: top; color: #738a94; margin-top: 20px; text-align: center; padding-bottom: 10px; padding-top: 10px; padding-left: 30px; padding-right: 30px; line-height: 1.5em; font-size: 13px;\\" valign=\\"top\\" align=\\"center\\">Ghost &#xA9; 2024 &#x2013; <a href=\\"http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid\\" style=\\"overflow-wrap: anywhere; color: #738a94; text-decoration: underline; font-size: 13px;\\" target=\\"_blank\\">Unsubscribe</a></td>
                                         </tr>
 
                                             <tr>
@@ -3673,7 +3673,7 @@ http://127.0.0.1:2369/r/xxxxxx?m=member-uuid
 
 
 
-Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&newsletter=requested-newsletter-uuid]
+Ghost © 2024 – Unsubscribe [http://127.0.0.1:2369/unsubscribe/?uuid=member-uuid&key=xxxxxx&newsletter=requested-newsletter-uuid]
 
 
 
diff --git a/ghost/core/test/integration/services/email-service/batch-sending.test.js b/ghost/core/test/integration/services/email-service/batch-sending.test.js
index 97a051822d5..3345ab21d98 100644
--- a/ghost/core/test/integration/services/email-service/batch-sending.test.js
+++ b/ghost/core/test/integration/services/email-service/batch-sending.test.js
@@ -673,12 +673,12 @@ describe('Batch sending tests', function () {
             assert.match(html, /Hey there, Hey ,/);
 
             // The unsubscribe link is replaced
-            assert.match(html, /<a href="http:\/\/127.0.0.1:2369\/unsubscribe\/\?uuid=[a-z0-9-]+&newsletter=[a-z0-9-]+"/, 'Unsubscribe link not found in html');
+            assert.match(html, /<a href="http:\/\/127.0.0.1:2369\/unsubscribe\/\?uuid=[a-z0-9-]+&key=[a-z0-9]+&newsletter=[a-z0-9-]+"/, 'Unsubscribe link not found in html');
 
             // Same for plaintext:
             assert.match(plaintext, /Hello {first_name},/);
             assert.match(plaintext, /Hey there, Hey ,/);
-            assert.match(plaintext, /\[http:\/\/127.0.0.1:2369\/unsubscribe\/\?uuid=[a-z0-9-]+&newsletter=[a-z0-9-]+\]/, 'Unsubscribe link not found in plaintext');
+            assert.match(plaintext, /\[http:\/\/127.0.0.1:2369\/unsubscribe\/\?uuid=[a-z0-9-]+&key=[a-z0-9]+&newsletter=[a-z0-9-]+\]/, 'Unsubscribe link not found in plaintext');
 
             await matchEmailSnapshot();
         });
@@ -707,12 +707,12 @@ describe('Batch sending tests', function () {
             assert.match(html, /Hey Simon, Hey Simon,/);
 
             // The unsubscribe link is replaced
-            assert.match(html, /<a href="http:\/\/127.0.0.1:2369\/unsubscribe\/\?uuid=[a-z0-9-]+&newsletter=[a-z0-9-]+"/, 'Unsubscribe link not found in html');
+            assert.match(html, /<a href="http:\/\/127.0.0.1:2369\/unsubscribe\/\?uuid=[a-z0-9-]+&key=[a-z0-9]+&newsletter=[a-z0-9-]+"/, 'Unsubscribe link not found in html');
 
             // Same for plaintext:
             assert.match(plaintext, /Hello {first_name},/);
             assert.match(plaintext, /Hey Simon, Hey Simon,/);
-            assert.match(plaintext, /\[http:\/\/127.0.0.1:2369\/unsubscribe\/\?uuid=[a-z0-9-]+&newsletter=[a-z0-9-]+\]/, 'Unsubscribe link not found in plaintext');
+            assert.match(plaintext, /\[http:\/\/127.0.0.1:2369\/unsubscribe\/\?uuid=[a-z0-9-]+&key=[a-z0-9]+&newsletter=[a-z0-9-]+\]/, 'Unsubscribe link not found in plaintext');
 
             await matchEmailSnapshot();
         });
diff --git a/ghost/core/test/utils/batch-email-utils.js b/ghost/core/test/utils/batch-email-utils.js
index 964e12a46cb..0e62524c29c 100644
--- a/ghost/core/test/utils/batch-email-utils.js
+++ b/ghost/core/test/utils/batch-email-utils.js
@@ -188,6 +188,10 @@ async function matchEmailSnapshot() {
         {
             match: linkRegexp,
             replacement: 'http://127.0.0.1:2369/r/xxxxxx'
+        },
+        {
+            match: /key=[0-9a-f]+/g,
+            replacement: 'key=xxxxxx'
         }
     ];