diff --git a/services/web/app/src/Features/Email/EmailBuilder.mjs b/services/web/app/src/Features/Email/EmailBuilder.mjs
index f87f5903f8..3de026eb6d 100644
--- a/services/web/app/src/Features/Email/EmailBuilder.mjs
+++ b/services/web/app/src/Features/Email/EmailBuilder.mjs
@@ -1040,6 +1040,36 @@ templates.groupMemberLimitWarning = ctaTemplate({
   },
 })
 
+templates.groupDomainCapturedByGroupChanged = ctaTemplate({
+  subject(opts) {
+    return opts.domainCapturedByGroup
+      ? `Domain capture now active for ${opts.domain}`
+      : `Domain capture now inactive for ${opts.domain}`
+  },
+  title(opts) {
+    return opts.domainCapturedByGroup
+      ? `Domain capture is active for ${_.escape(opts.domain)}`
+      : `Domain capture is inactive for ${_.escape(opts.domain)}`
+  },
+  message(opts) {
+    if (opts.domainCapturedByGroup) {
+      return [
+        `Users with a <b>${_.escape(opts.domain)}</b> email address on their account will be able to join your group through domain capture.`,
+      ]
+    }
+    return [
+      `Users with a <b>${_.escape(opts.domain)}</b> email address on their account will no longer be able to join your group through domain capture. Anyone already in your group is unaffected.`,
+      `If you didn't expect this or want to re-enable it, please contact ${settings.adminEmail}.`,
+    ]
+  },
+  ctaText() {
+    return 'Manage domains'
+  },
+  ctaURL(opts) {
+    return `${settings.siteUrl}/manage/groups/${opts.groupId}/settings`
+  },
+})
+
 function _formatUserNameAndEmail(user, placeholder) {
   if (user.first_name && user.last_name) {
     const fullName = `${user.first_name} ${user.last_name}`
diff --git a/services/web/test/unit/src/Email/EmailBuilder.test.mjs b/services/web/test/unit/src/Email/EmailBuilder.test.mjs
index 7e8843f705..508c59fe7f 100644
--- a/services/web/test/unit/src/Email/EmailBuilder.test.mjs
+++ b/services/web/test/unit/src/Email/EmailBuilder.test.mjs
@@ -14,6 +14,7 @@ describe('EmailBuilder', function () {
     ctx.settings = {
       appName: 'testApp',
       siteUrl: 'https://www.overleaf.com',
+      adminEmail: 'admin@overleaf.test',
     }
 
     vi.doMock('../../../../app/src/Features/Email/EmailMessageHelper', () => ({
@@ -963,6 +964,50 @@ describe('EmailBuilder', function () {
           })
         })
       })
+
+      describe('groupDomainCapturedByGroupChanged', function () {
+        it('should build active-domain-capture email', function (ctx) {
+          const email = ctx.EmailBuilder.buildEmail(
+            'groupDomainCapturedByGroupChanged',
+            {
+              to: 'admin@example.com',
+              groupId: 'group-123',
+              domainCapturedByGroup: true,
+              domain: 'example.com',
+            }
+          )
+
+          expect(email.subject).to.equal(
+            'Domain capture now active for example.com'
+          )
+          expect(email.html).to.contain(
+            'Domain capture is active for example.com'
+          )
+          expect(email.html).to.contain('/manage/groups/group-123/settings')
+          expect(email.text).to.contain('/manage/groups/group-123/settings')
+        })
+
+        it('should build inactive-domain-capture email including support contact', function (ctx) {
+          const email = ctx.EmailBuilder.buildEmail(
+            'groupDomainCapturedByGroupChanged',
+            {
+              to: 'admin@example.com',
+              groupId: 'group-123',
+              domainCapturedByGroup: false,
+              domain: 'example.com',
+            }
+          )
+
+          expect(email.subject).to.equal(
+            'Domain capture now inactive for example.com'
+          )
+          expect(email.html).to.contain(
+            'Domain capture is inactive for example.com'
+          )
+          expect(email.html).to.contain('admin@overleaf.test')
+          expect(email.text).to.contain('admin@overleaf.test')
+        })
+      })
     })
   })
 })