diff --git a/open-api/immich-openapi-specs.json b/open-api/immich-openapi-specs.json
index 02d7fc80e..60623a4a8 100644
--- a/open-api/immich-openapi-specs.json
+++ b/open-api/immich-openapi-specs.json
@@ -19664,7 +19664,7 @@
             "description": "User email",
             "example": "testuser@email.com",
             "format": "email",
-            "pattern": "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$",
+            "pattern": "^[\\p{L}\\p{M}\\p{N}.!#$%&'*+/=?^_`{|}~-]+@[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?(?:\\.[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?)*$",
             "type": "string"
           },
           "password": {
@@ -19708,7 +19708,7 @@
           "userEmail": {
             "description": "User email",
             "format": "email",
-            "pattern": "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$",
+            "pattern": "^[\\p{L}\\p{M}\\p{N}.!#$%&'*+/=?^_`{|}~-]+@[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?(?:\\.[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?)*$",
             "type": "string"
           },
           "userId": {
@@ -20861,7 +20861,7 @@
           "email": {
             "description": "User email",
             "format": "email",
-            "pattern": "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$",
+            "pattern": "^[\\p{L}\\p{M}\\p{N}.!#$%&'*+/=?^_`{|}~-]+@[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?(?:\\.[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?)*$",
             "type": "string"
           },
           "id": {
@@ -23429,7 +23429,7 @@
             "description": "User email",
             "example": "testuser@email.com",
             "format": "email",
-            "pattern": "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$",
+            "pattern": "^[\\p{L}\\p{M}\\p{N}.!#$%&'*+/=?^_`{|}~-]+@[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?(?:\\.[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?)*$",
             "type": "string"
           },
           "name": {
@@ -27488,7 +27488,7 @@
           "email": {
             "description": "User email",
             "format": "email",
-            "pattern": "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$",
+            "pattern": "^[\\p{L}\\p{M}\\p{N}.!#$%&'*+/=?^_`{|}~-]+@[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?(?:\\.[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?)*$",
             "type": "string"
           },
           "isAdmin": {
@@ -27570,7 +27570,7 @@
           "email": {
             "description": "User email",
             "format": "email",
-            "pattern": "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$",
+            "pattern": "^[\\p{L}\\p{M}\\p{N}.!#$%&'*+/=?^_`{|}~-]+@[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?(?:\\.[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?)*$",
             "type": "string"
           },
           "id": {
@@ -27676,7 +27676,7 @@
           "email": {
             "description": "User email",
             "format": "email",
-            "pattern": "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$",
+            "pattern": "^[\\p{L}\\p{M}\\p{N}.!#$%&'*+/=?^_`{|}~-]+@[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?(?:\\.[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?)*$",
             "type": "string"
           },
           "isAdmin": {
@@ -27875,7 +27875,7 @@
           "email": {
             "description": "User email",
             "format": "email",
-            "pattern": "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$",
+            "pattern": "^[\\p{L}\\p{M}\\p{N}.!#$%&'*+/=?^_`{|}~-]+@[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?(?:\\.[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?)*$",
             "type": "string"
           },
           "id": {
@@ -27930,7 +27930,7 @@
           "email": {
             "description": "User email",
             "format": "email",
-            "pattern": "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$",
+            "pattern": "^[\\p{L}\\p{M}\\p{N}.!#$%&'*+/=?^_`{|}~-]+@[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?(?:\\.[\\p{L}\\p{N}](?:[\\p{L}\\p{M}\\p{N}-]{0,61}[\\p{L}\\p{M}\\p{N}])?)*$",
             "type": "string"
           },
           "name": {
diff --git a/server/src/validation.spec.ts b/server/src/validation.spec.ts
index 434ac89ce..7305c4d5c 100644
--- a/server/src/validation.spec.ts
+++ b/server/src/validation.spec.ts
@@ -1,4 +1,4 @@
-import { IsNotSiblingOf } from 'src/validation';
+import { IsNotSiblingOf, toEmail } from 'src/validation';
 import { describe, expect, it } from 'vitest';
 import z from 'zod';
 
@@ -42,4 +42,32 @@ describe('Validation', () => {
       expect(result.success).toBe(true);
     });
   });
+
+  describe('toEmail', () => {
+    it.each([
+      'test@immich.cloud',
+      'test@immich',
+      'first.last+tag@immich.cloud',
+      // unicode local parts and internationalized domain names
+      'tëst@immich.cloud',
+      'leoñ@immich.cloud',
+      'test@яндекс.рф',
+      'test@xn--d1acpjx3f.xn--p1ai',
+      '用户@例子.广告',
+      'test@ท่องเที่ยว.ไทย',
+    ])('should accept %s', (email) => {
+      expect(toEmail.safeParse(email).success).toBe(true);
+    });
+
+    it.each(['immich', 'test@@immich.cloud', 'test user@immich.cloud', 'test@immich..cloud', 'test@-immich.cloud'])(
+      'should reject %s',
+      (email) => {
+        expect(toEmail.safeParse(email).success).toBe(false);
+      },
+    );
+
+    it('should convert the email to lower case', () => {
+      expect(toEmail.parse('tÉst@Immich.Cloud')).toBe('tést@immich.cloud');
+    });
+  });
 });
diff --git a/server/src/validation.ts b/server/src/validation.ts
index f8de2a68f..467a87b67 100644
--- a/server/src/validation.ts
+++ b/server/src/validation.ts
@@ -119,14 +119,22 @@ const FilenameParamSchema = z.object({
 
 export class FilenameParamDto extends createZodDto(FilenameParamSchema) {}
 
+/**
+ * The HTML5 email regex, but with unicode support, so that international email addresses
+ * (unicode local parts and internationalized domain names) are accepted.
+ * @see {@link z.regexes.html5Email}
+ */
+const unicodeEmail =
+  /^[\p{L}\p{M}\p{N}.!#$%&'*+/=?^_`{|}~-]+@[\p{L}\p{N}](?:[\p{L}\p{M}\p{N}-]{0,61}[\p{L}\p{M}\p{N}])?(?:\.[\p{L}\p{N}](?:[\p{L}\p{M}\p{N}-]{0,61}[\p{L}\p{M}\p{N}])?)*$/u;
+
 /**
  * Unified email validation
- * Converts email strings to lowercase and validates against HTML5 email regex
+ * Converts email strings to lowercase and validates against a unicode aware email regex
  * @docs https://zod.dev/api?id=email
  */
 export const toEmail = z
   .email({
-    pattern: z.regexes.html5Email,
+    pattern: unicodeEmail,
     error: (iss) => `Invalid input: expected email, received ${typeof iss.input}`,
   })
   .transform((val) => val.toLowerCase());