diff --git a/deno/lib/__tests__/string.test.ts b/deno/lib/__tests__/string.test.ts
index 3f5b95562..3bef7f1f6 100644
--- a/deno/lib/__tests__/string.test.ts
+++ b/deno/lib/__tests__/string.test.ts
@@ -66,6 +66,7 @@ test("email validations", () => {
     `tom@test.te-st.com`,
     `something@subdomain.domain-with-hyphens.tld`,
     `common'name@domain.com`,
+    `a!test@domain.com`,
     `francois@etu.inp-n7.fr`,
   ];
   const invalidEmails = [
diff --git a/deno/lib/types.ts b/deno/lib/types.ts
index bbc414ed4..d1aadc705 100644
--- a/deno/lib/types.ts
+++ b/deno/lib/types.ts
@@ -596,10 +596,12 @@ const durationRegex =
 //   /^[a-zA-Z0-9\.\!\#\$\%\&\'\*\+\/\=\?\^\_\`\{\|\}\~\-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/;
 // const emailRegex =
 //   /^(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])$/i;
-const emailRegex =
-  /^(?!\.)(?!.*\.\.)([A-Z0-9_'+\-\.]*)[A-Z0-9_+-]@([A-Z0-9][A-Z0-9\-]*\.)+[A-Z]{2,}$/i;
+// const emailRegex =
+//   /^(?!\.)(?!.*\.\.)([A-Z0-9_'+\-\.]*)[A-Z0-9_+-]@([A-Z0-9][A-Z0-9\-]*\.)+[A-Z]{2,}$/i;
 // const emailRegex =
 //   /^[a-z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-z0-9-]+(?:\.[a-z0-9\-]+)*$/i;
+const emailRegex =
+  /^(?!\.)(?!.*\.\.)([A-Z0-9_'+\-\.!]*)[A-Z0-9_+!\-]@([A-Z0-9][A-Z0-9\-]*\.)+[A-Z]{2,}$/i;
 
 // from https://thekevinscott.com/emojis-in-javascript/#writing-a-regular-expression
 const _emojiRegex = `^(\\p{Extended_Pictographic}|\\p{Emoji_Component})+$`;
diff --git a/src/__tests__/string.test.ts b/src/__tests__/string.test.ts
index db01a64eb..39552630f 100644
--- a/src/__tests__/string.test.ts
+++ b/src/__tests__/string.test.ts
@@ -65,6 +65,7 @@ test("email validations", () => {
     `tom@test.te-st.com`,
     `something@subdomain.domain-with-hyphens.tld`,
     `common'name@domain.com`,
+    `a!test@domain.com`,
     `francois@etu.inp-n7.fr`,
   ];
   const invalidEmails = [
diff --git a/src/types.ts b/src/types.ts
index 172d767c3..e9cb3f6ff 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -596,11 +596,14 @@ const durationRegex =
 //   /^[a-zA-Z0-9\.\!\#\$\%\&\'\*\+\/\=\?\^\_\`\{\|\}\~\-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/;
 // const emailRegex =
 //   /^(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])$/i;
-const emailRegex =
-  /^(?!\.)(?!.*\.\.)([A-Z0-9_'+\-\.]*)[A-Z0-9_+-]@([A-Z0-9][A-Z0-9\-]*\.)+[A-Z]{2,}$/i;
+// const emailRegex =
+//   /^(?!\.)(?!.*\.\.)([A-Z0-9_'+\-\.]*)[A-Z0-9_+-]@([A-Z0-9][A-Z0-9\-]*\.)+[A-Z]{2,}$/i;
 // const emailRegex =
 //   /^[a-z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-z0-9-]+(?:\.[a-z0-9\-]+)*$/i;
 
+const emailRegex =
+  /^(?!\.)(?!.*\.\.)([A-Z0-9_'+\-\.!]*)[A-Z0-9_+!\-]@([A-Z0-9][A-Z0-9\-]*\.)+[A-Z]{2,}$/i;
+
 // from https://thekevinscott.com/emojis-in-javascript/#writing-a-regular-expression
 const _emojiRegex = `^(\\p{Extended_Pictographic}|\\p{Emoji_Component})+$`;
 let emojiRegex: RegExp;