diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2ac0df06..b85e9109 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+* [PR-353](https://github.com/itk-dev/hoeringsportal/pull/353)
+  Added “Allow email” checkboxes
 * [PR-351](https://github.com/itk-dev/hoeringsportal/pull/351)
   Added and used citizen proposal text format
 * [PR-350](https://github.com/itk-dev/hoeringsportal/pull/350)
diff --git a/config/sync/core.entity_form_display.node.citizen_proposal.default.yml b/config/sync/core.entity_form_display.node.citizen_proposal.default.yml
index a086dd48..b23e4b8c 100644
--- a/config/sync/core.entity_form_display.node.citizen_proposal.default.yml
+++ b/config/sync/core.entity_form_display.node.citizen_proposal.default.yml
@@ -3,6 +3,7 @@ langcode: da
 status: true
 dependencies:
   config:
+    - field.field.node.citizen_proposal.field_author_allow_email
     - field.field.node.citizen_proposal.field_author_email
     - field.field.node.citizen_proposal.field_author_email_display
     - field.field.node.citizen_proposal.field_author_name
@@ -42,6 +43,13 @@ targetEntityType: node
 bundle: citizen_proposal
 mode: default
 content:
+  field_author_allow_email:
+    type: boolean_checkbox
+    weight: 4
+    region: content
+    settings:
+      display_label: true
+    third_party_settings: {  }
   field_author_email:
     type: email_default
     weight: 2
@@ -83,7 +91,7 @@ content:
     third_party_settings: {  }
   field_more_info:
     type: text_textarea
-    weight: 7
+    weight: 8
     region: content
     settings:
       rows: 5
@@ -94,7 +102,7 @@ content:
         hide_guidelines: '1'
   field_proposal:
     type: text_textarea
-    weight: 5
+    weight: 6
     region: content
     settings:
       rows: 5
@@ -105,7 +113,7 @@ content:
         hide_guidelines: '1'
   field_remarks:
     type: text_textarea
-    weight: 6
+    weight: 7
     region: content
     settings:
       rows: 5
@@ -116,14 +124,14 @@ content:
         hide_guidelines: '1'
   status:
     type: boolean_checkbox
-    weight: 8
+    weight: 9
     region: content
     settings:
       display_label: true
     third_party_settings: {  }
   title:
     type: string_textfield
-    weight: 4
+    weight: 5
     region: content
     settings:
       size: 60
diff --git a/config/sync/core.entity_view_display.node.citizen_proposal.citizen_proposal_add.yml b/config/sync/core.entity_view_display.node.citizen_proposal.citizen_proposal_add.yml
index ed1c1f7a..4926e446 100644
--- a/config/sync/core.entity_view_display.node.citizen_proposal.citizen_proposal_add.yml
+++ b/config/sync/core.entity_view_display.node.citizen_proposal.citizen_proposal_add.yml
@@ -4,6 +4,7 @@ status: true
 dependencies:
   config:
     - core.entity_view_mode.node.citizen_proposal_add
+    - field.field.node.citizen_proposal.field_author_allow_email
     - field.field.node.citizen_proposal.field_author_email
     - field.field.node.citizen_proposal.field_author_email_display
     - field.field.node.citizen_proposal.field_author_name
@@ -122,6 +123,7 @@ content:
     weight: 100
     region: content
 hidden:
+  field_author_allow_email: true
   field_author_email_display: true
   field_author_phone: true
   field_author_uuid: true
diff --git a/config/sync/core.entity_view_display.node.citizen_proposal.citizen_proposal_approval.yml b/config/sync/core.entity_view_display.node.citizen_proposal.citizen_proposal_approval.yml
index d9cc4cd1..c2d187ac 100644
--- a/config/sync/core.entity_view_display.node.citizen_proposal.citizen_proposal_approval.yml
+++ b/config/sync/core.entity_view_display.node.citizen_proposal.citizen_proposal_approval.yml
@@ -4,6 +4,7 @@ status: true
 dependencies:
   config:
     - core.entity_view_mode.node.citizen_proposal_approval
+    - field.field.node.citizen_proposal.field_author_allow_email
     - field.field.node.citizen_proposal.field_author_email
     - field.field.node.citizen_proposal.field_author_email_display
     - field.field.node.citizen_proposal.field_author_name
@@ -55,6 +56,7 @@ content:
     weight: 1
     region: content
 hidden:
+  field_author_allow_email: true
   field_author_email_display: true
   field_author_phone: true
   field_author_uuid: true
diff --git a/config/sync/core.entity_view_display.node.citizen_proposal.default.yml b/config/sync/core.entity_view_display.node.citizen_proposal.default.yml
index 7c387cf1..4d7e624c 100644
--- a/config/sync/core.entity_view_display.node.citizen_proposal.default.yml
+++ b/config/sync/core.entity_view_display.node.citizen_proposal.default.yml
@@ -136,6 +136,7 @@ content:
     weight: 9
     region: right
 hidden:
+  field_author_allow_email: true
   field_author_email_display: true
   field_author_phone: true
   field_author_uuid: true
diff --git a/config/sync/core.entity_view_display.node.citizen_proposal.list_display.yml b/config/sync/core.entity_view_display.node.citizen_proposal.list_display.yml
index 0935b2f2..68ea9fc6 100644
--- a/config/sync/core.entity_view_display.node.citizen_proposal.list_display.yml
+++ b/config/sync/core.entity_view_display.node.citizen_proposal.list_display.yml
@@ -4,6 +4,7 @@ status: true
 dependencies:
   config:
     - core.entity_view_mode.node.list_display
+    - field.field.node.citizen_proposal.field_author_allow_email
     - field.field.node.citizen_proposal.field_author_email
     - field.field.node.citizen_proposal.field_author_email_display
     - field.field.node.citizen_proposal.field_author_name
@@ -103,6 +104,7 @@ content:
     weight: 100
     region: content
 hidden:
+  field_author_allow_email: true
   field_author_email_display: true
   field_author_phone: true
   field_author_uuid: true
diff --git a/config/sync/core.entity_view_display.node.citizen_proposal.teaser.yml b/config/sync/core.entity_view_display.node.citizen_proposal.teaser.yml
index ddde63b7..f081829a 100644
--- a/config/sync/core.entity_view_display.node.citizen_proposal.teaser.yml
+++ b/config/sync/core.entity_view_display.node.citizen_proposal.teaser.yml
@@ -4,6 +4,7 @@ status: true
 dependencies:
   config:
     - core.entity_view_mode.node.teaser
+    - field.field.node.citizen_proposal.field_author_allow_email
     - field.field.node.citizen_proposal.field_author_email
     - field.field.node.citizen_proposal.field_author_email_display
     - field.field.node.citizen_proposal.field_author_name
@@ -51,6 +52,7 @@ content:
     weight: 1
     region: content
 hidden:
+  field_author_allow_email: true
   field_author_email: true
   field_author_email_display: true
   field_author_phone: true
diff --git a/config/sync/field.field.node.citizen_proposal.field_author_allow_email.yml b/config/sync/field.field.node.citizen_proposal.field_author_allow_email.yml
new file mode 100644
index 00000000..b887e80e
--- /dev/null
+++ b/config/sync/field.field.node.citizen_proposal.field_author_allow_email.yml
@@ -0,0 +1,23 @@
+uuid: 8d3748de-e723-46a5-b473-0135dd28153e
+langcode: da
+status: true
+dependencies:
+  config:
+    - field.storage.node.field_author_allow_email
+    - node.type.citizen_proposal
+id: node.citizen_proposal.field_author_allow_email
+field_name: field_author_allow_email
+entity_type: node
+bundle: citizen_proposal
+label: 'Allow email'
+description: 'Author accepts receiving emails.'
+required: false
+translatable: false
+default_value:
+  -
+    value: 0
+default_value_callback: ''
+settings:
+  on_label: 'On'
+  off_label: 'Off'
+field_type: boolean
diff --git a/config/sync/field.storage.node.field_author_allow_email.yml b/config/sync/field.storage.node.field_author_allow_email.yml
new file mode 100644
index 00000000..42168f75
--- /dev/null
+++ b/config/sync/field.storage.node.field_author_allow_email.yml
@@ -0,0 +1,18 @@
+uuid: a831ce9e-944a-45fa-a981-3978c9841237
+langcode: da
+status: true
+dependencies:
+  module:
+    - node
+id: node.field_author_allow_email
+field_name: field_author_allow_email
+entity_type: node
+type: boolean
+settings: {  }
+module: core
+locked: false
+cardinality: 1
+translatable: true
+indexes: {  }
+persist_with_no_fields: false
+custom_storage: false
diff --git a/config/sync/views.view.citizen_proposal_support.yml b/config/sync/views.view.citizen_proposal_support.yml
index 854a4cdf..fef4f33f 100644
--- a/config/sync/views.view.citizen_proposal_support.yml
+++ b/config/sync/views.view.citizen_proposal_support.yml
@@ -126,6 +126,63 @@ display:
           hide_empty: false
           empty_zero: false
           hide_alter_empty: true
+        allow_email:
+          id: allow_email
+          table: hoeringsportal_citizen_proposal_support
+          field: allow_email
+          relationship: none
+          group_type: group
+          admin_label: ''
+          plugin_id: numeric
+          label: 'Tillad e-mail'
+          exclude: false
+          alter:
+            alter_text: true
+            text: '{{ allow_email ? ''ja'' }}'
+            make_link: false
+            path: ''
+            absolute: false
+            external: false
+            replace_spaces: false
+            path_case: none
+            trim_whitespace: false
+            alt: ''
+            rel: ''
+            link_class: ''
+            prefix: ''
+            suffix: ''
+            target: ''
+            nl2br: false
+            max_length: 0
+            word_boundary: true
+            ellipsis: true
+            more_link: false
+            more_link_text: ''
+            more_link_path: ''
+            strip_tags: false
+            trim: false
+            preserve_tags: ''
+            html: false
+          element_type: ''
+          element_class: ''
+          element_label_type: ''
+          element_label_class: ''
+          element_label_colon: true
+          element_wrapper_type: ''
+          element_wrapper_class: ''
+          element_default_classes: true
+          empty: ''
+          hide_empty: false
+          empty_zero: false
+          hide_alter_empty: true
+          set_precision: false
+          precision: 0
+          decimal: .
+          separator: ''
+          format_plural: false
+          format_plural_string: !!binary MQNAY291bnQ=
+          prefix: ''
+          suffix: ''
         created:
           id: created
           table: hoeringsportal_citizen_proposal_support
@@ -366,7 +423,7 @@ display:
           group_type: group
           admin_label: ''
           plugin_id: standard
-          label: Name
+          label: Navn
           exclude: false
           alter:
             alter_text: false
@@ -415,7 +472,7 @@ display:
           group_type: group
           admin_label: ''
           plugin_id: standard
-          label: Email
+          label: E-mail
           exclude: false
           alter:
             alter_text: false
@@ -456,6 +513,63 @@ display:
           hide_empty: false
           empty_zero: false
           hide_alter_empty: true
+        allow_email:
+          id: allow_email
+          table: hoeringsportal_citizen_proposal_support
+          field: allow_email
+          relationship: none
+          group_type: group
+          admin_label: ''
+          plugin_id: numeric
+          label: 'Tillad e-mail'
+          exclude: false
+          alter:
+            alter_text: true
+            text: '{{ allow_email ? 1 }}'
+            make_link: false
+            path: ''
+            absolute: false
+            external: false
+            replace_spaces: false
+            path_case: none
+            trim_whitespace: false
+            alt: ''
+            rel: ''
+            link_class: ''
+            prefix: ''
+            suffix: ''
+            target: ''
+            nl2br: false
+            max_length: 0
+            word_boundary: true
+            ellipsis: true
+            more_link: false
+            more_link_text: ''
+            more_link_path: ''
+            strip_tags: false
+            trim: false
+            preserve_tags: ''
+            html: false
+          element_type: ''
+          element_class: ''
+          element_label_type: ''
+          element_label_class: ''
+          element_label_colon: true
+          element_wrapper_type: ''
+          element_wrapper_class: ''
+          element_default_classes: true
+          empty: ''
+          hide_empty: false
+          empty_zero: false
+          hide_alter_empty: true
+          set_precision: false
+          precision: 0
+          decimal: .
+          separator: ''
+          format_plural: false
+          format_plural_string: !!binary MQNAY291bnQ=
+          prefix: ''
+          suffix: ''
       style:
         type: data_export
         options:
diff --git a/web/modules/custom/hoeringsportal_citizen_proposal/hoeringsportal_citizen_proposal.install b/web/modules/custom/hoeringsportal_citizen_proposal/hoeringsportal_citizen_proposal.install
index 9d233aa4..54d5685f 100644
--- a/web/modules/custom/hoeringsportal_citizen_proposal/hoeringsportal_citizen_proposal.install
+++ b/web/modules/custom/hoeringsportal_citizen_proposal/hoeringsportal_citizen_proposal.install
@@ -47,6 +47,14 @@ function hoeringsportal_citizen_proposal_schema(): array {
         'length' => 255,
         'not null' => FALSE,
       ],
+      'allow_email' => [
+        'description' => 'The proposal supporter allows email',
+        'type' => 'int',
+        'size' => 'tiny',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+        'default' => 0,
+      ],
       'created' => [
         'description' => 'The time of creation',
         'type' => 'int',
@@ -183,3 +191,22 @@ function hoeringsportal_citizen_proposal_update_9003(): void {
     'symfony_mailer',
   ]);
 }
+
+/**
+ * Adds allow email column.
+ */
+function hoeringsportal_citizen_proposal_update_9004(): void {
+  $schema = \Drupal::database()->schema();
+
+  $table_name = 'hoeringsportal_citizen_proposal_support';
+  $field_name = 'allow_email';
+  $spec = [
+    'description' => 'The proposal supporter allows email',
+    'type' => 'int',
+    'size' => 'tiny',
+    'unsigned' => TRUE,
+    'not null' => TRUE,
+    'default' => 0,
+  ];
+  $schema->addField($table_name, $field_name, $spec);
+}
diff --git a/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalAdminForm.php b/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalAdminForm.php
index ba387e10..fc54f1e1 100644
--- a/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalAdminForm.php
+++ b/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalAdminForm.php
@@ -113,6 +113,13 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       '#default_value' => $adminFormStateValues['email_display_help'] ?? '',
     ];
 
+    $form['add_form']['allow_email_help'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Allow email help'),
+      '#default_value' => $adminFormStateValues['allow_email_help'] ?? '',
+      '#description' => $this->t('Use <code>&lt;a target=&quot;_blank&quot; href=&quot;…&quot;&gt;Read more about the emails we may send&lt;/a&gt;</code> to insert a link to details on what emails might be sent.'),
+    ];
+
     $form['add_form']['proposal_intro'] = [
       '#type' => 'text_format',
       '#title' => $this->t('Proposal intro'),
@@ -215,6 +222,13 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       '#default_value' => $adminFormStateValues['support_email_help'] ?? '',
     ];
 
+    $form['support_form']['support_allow_email_help'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Allow email help'),
+      '#default_value' => $adminFormStateValues['support_allow_email_help'] ?? '',
+      '#description' => $this->t('Use <code>&lt;a target=&quot;_blank&quot; href=&quot;…&quot;&gt;Read more about the emails we may send&lt;/a&gt;</code> to insert a link to details on what emails might be sent.'),
+    ];
+
     $form['support_form']['support_goto_url'] = [
       '#type' => 'textfield',
       '#title' => $this->t('Redirect URL after a proposal has been supported'),
diff --git a/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormAdd.php b/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormAdd.php
index 91b454c2..46a2d2a7 100644
--- a/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormAdd.php
+++ b/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormAdd.php
@@ -88,6 +88,14 @@ public function buildProposalForm(array $form, FormStateInterface $formState): a
       '#description_display' => 'before',
     ];
 
+    $form['allow_email'] = [
+      '#type' => 'checkbox',
+      '#title' => $this
+        ->t('Allow email'),
+      '#default_value' => $defaltValues['allow_email'] ?? FALSE,
+      '#description' => $this->getAdminFormStateValue('allow_email_help'),
+    ];
+
     $form['proposal_intro_container'] = [
       '#type' => 'container',
       '#attributes' => ['class' => ['mt-5']],
@@ -280,6 +288,7 @@ public function submitForm(array &$form, FormStateInterface $formState): void {
       'field_author_email_display' => $formState->getValue('email_display'),
       'field_proposal' => $formState->getValue('proposal'),
       'field_remarks' => $formState->getValue('remarks'),
+      'field_author_allow_email' => $formState->getValue('allow_email'),
     ]);
     $this->helper->setDraftProposal($entity);
     $formState
diff --git a/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormApprove.php b/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormApprove.php
index 77766114..66bdee6b 100644
--- a/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormApprove.php
+++ b/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormApprove.php
@@ -122,6 +122,17 @@ public function buildProposalForm(array $form, FormStateInterface $formState): a
       ],
     ];
 
+    $form['allow_email'] = [
+      '#type' => 'checkbox',
+      '#title' => $this
+        ->t('Allow email'),
+      '#default_value' => $defaltValues['allow_email'],
+      '#description' => $this->getAdminFormStateValue('allow_email_help'),
+      '#attributes' => [
+        'disabled' => 'disabled',
+      ],
+    ];
+
     $form['actions']['#type'] = 'actions';
     $form['actions']['submit'] = [
       '#type' => 'submit',
diff --git a/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormBase.php b/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormBase.php
index 3d9b6487..b309500f 100644
--- a/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormBase.php
+++ b/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormBase.php
@@ -142,6 +142,7 @@ protected function getDefaultFormValues(): array {
       'title' => $entity?->title->value ?? NULL,
       'proposal' => $entity?->field_proposal->value ?? '',
       'remarks' => $entity?->field_remarks->value ?? '',
+      'allow_email' => $entity?->field_author_allow_email->value ?? FALSE,
     ];
   }
 
diff --git a/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormSupport.php b/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormSupport.php
index 382ac4da..080009ad 100644
--- a/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormSupport.php
+++ b/web/modules/custom/hoeringsportal_citizen_proposal/src/Form/ProposalFormSupport.php
@@ -95,7 +95,6 @@ protected function buildProposalForm(array $form, FormStateInterface $formState)
 
     $form['email'] = [
       '#type' => 'email',
-      '#required' => TRUE,
       '#title' => $this
         ->t('Email'),
       '#default_value' => $defaltValues['email'],
@@ -103,6 +102,19 @@ protected function buildProposalForm(array $form, FormStateInterface $formState)
       '#description_display' => 'before',
     ];
 
+    $form['allow_email'] = [
+      '#type' => 'checkbox',
+      '#title' => $this
+        ->t('Allow email'),
+      '#default_value' => $defaltValues['support_allow_email_help'] ?? FALSE,
+      '#description' => $this->getAdminFormStateValue('support_allow_email_help'),
+      '#states' => [
+        'visible' => [
+          ':input[name="email"]' => ['filled' => TRUE],
+        ],
+      ],
+    ];
+
     $form['consent'] = [
       '#type' => 'checkbox',
       '#title' => $this
@@ -154,6 +166,7 @@ public function submitForm(array &$form, FormStateInterface $form_state): void {
         [
           'user_name' => $form_state->getValue('name'),
           'user_email' => $form_state->getValue('email'),
+          'allow_email' => $form_state->getValue('allow_email'),
         ],
       );
       $this->messenger()->addStatus($this->getAdminFormStateValue('support_submission_text', $this->t('Thank you for your support.')));
diff --git a/web/modules/custom/hoeringsportal_citizen_proposal/src/Helper/Helper.php b/web/modules/custom/hoeringsportal_citizen_proposal/src/Helper/Helper.php
index 4c43852b..ad67157f 100644
--- a/web/modules/custom/hoeringsportal_citizen_proposal/src/Helper/Helper.php
+++ b/web/modules/custom/hoeringsportal_citizen_proposal/src/Helper/Helper.php
@@ -218,6 +218,7 @@ public function saveSupport(string $userIdentifier, NodeInterface $node, array $
     try {
       $values['user_identifier'] = $userIdentifier;
       $values['node_id'] = $node->id();
+      $values['allow_email'] = ($values['allow_email'] ?? FALSE) ? 1 : 0;
       // Set some defaults.
       $values += [
         'created' => $this->time->getRequestTime(),
@@ -238,7 +239,8 @@ public function saveSupport(string $userIdentifier, NodeInterface $node, array $
         'exception' => $exception,
         'values' => $values,
       ]);
-      $this->messenger()->addError($this->t('Something went wrong. Your support was not registered.'));
+
+      throw $exception;
     }
   }