diff --git a/api/api/v1/accounts/lookup/index.ts b/api/api/v1/accounts/lookup/index.ts
index 63507810..f09a9ada 100644
--- a/api/api/v1/accounts/lookup/index.ts
+++ b/api/api/v1/accounts/lookup/index.ts
@@ -1,4 +1,4 @@
-import { apiRoute, applyConfig, auth, userAddressValidator } from "@/api";
+import { apiRoute, applyConfig, auth, userAddressValidatorRemote } from "@/api";
 import { createRoute } from "@hono/zod-openapi";
 import { User } from "@versia/kit/db";
 import { RolePermissions, Users } from "@versia/kit/tables";
@@ -62,7 +62,7 @@ export default apiRoute((app) =>
         const { user } = context.get("auth");
 
         // Check if acct is matching format username@domain.com or @username@domain.com
-        const accountMatches = acct?.trim().match(userAddressValidator);
+        const accountMatches = acct?.trim().match(userAddressValidatorRemote);
 
         if (accountMatches) {
             // Remove leading @ if it exists
diff --git a/utils/api.ts b/utils/api.ts
index beaad45b..319a4a04 100644
--- a/utils/api.ts
+++ b/utils/api.ts
@@ -106,6 +106,16 @@ export const userAddressValidator = createRegExp(
     [global],
 );
 
+export const userAddressValidatorRemote = createRegExp(
+    maybe("@"),
+    oneOrMore(anyOf(letter.lowercase, digit, charIn("-_"))).groupedAs(
+        "username",
+    ),
+    exactly("@"),
+    oneOrMore(anyOf(letter, digit, charIn("_-.:"))).groupedAs("domain"),
+    [global],
+);
+
 export const webfingerMention = createRegExp(
     exactly("acct:"),
     oneOrMore(anyOf(letter, digit, charIn("-_"))).groupedAs("username"),