diff --git a/src/lib/domain/notification-provider.ts b/src/lib/domain/notification-provider.ts
index cb911818..ff43b8b3 100644
--- a/src/lib/domain/notification-provider.ts
+++ b/src/lib/domain/notification-provider.ts
@@ -27,7 +27,7 @@ export const emailProviderConfigSchema = z.object({
   port: z.number().int().min(1).max(65535),
   secure: z.boolean(),
   auth: z.object({
-    user: z.email('Valid email is required'),
+    user: z.string().min(1, 'Username is required'),
     pass: z.string().min(1, 'Password is required')
   }),
   from: z.email('Valid sender email is required'),
@@ -111,7 +111,7 @@ const emailProviderConfigUpdateSchema = z.object({
   port: z.number().int().min(1).max(65535),
   secure: z.boolean(),
   auth: z.object({
-    user: z.email('Valid email is required'),
+    user: z.string().min(1, 'Username is required'),
     pass: z.string()
   }),
   from: z.email('Valid sender email is required'),