diff --git a/max/routes/alias/create.py b/max/routes/alias/create.py
index 2e7bd8a..0c298c5 100644
--- a/max/routes/alias/create.py
+++ b/max/routes/alias/create.py
@@ -39,15 +39,16 @@ class AliasCreate(
         else:
             self.domain = self.get_user_domain()
 
-        full_email = f"{self.email}@{self.domain}"
-        if not self.is_email_valid(full_email):
-            error = True
-        elif not self.auth_user.is_admin and self.is_reserved_email(full_email):
-            flash(
-                t("This address is reserved and can only be created by an admin."),
-                category="error",
-            )
-            error = True
+        if not error:
+            full_email = f"{self.email}@{self.domain}"
+            if not self.is_email_valid(full_email):
+                error = True
+            elif not self.auth_user.is_admin and self.is_reserved_email(full_email):
+                flash(
+                    t("This address is reserved and can only be created by an admin."),
+                    category="error",
+                )
+                error = True
 
         enabled = self.request.form.get("enabled")
         if enabled == "on":
diff --git a/max/routes/user/create.py b/max/routes/user/create.py
index dc56134..cc1c580 100644
--- a/max/routes/user/create.py
+++ b/max/routes/user/create.py
@@ -32,9 +32,10 @@ class UserCreate(AllowAdmin, CheckEmailMixin, BackToUsersMixin, BaseTemplateGetV
         else:
             self.domain = domain
 
-        full_email = f"{self.email}@{self.domain}"
-        if not self.is_email_valid(full_email):
-            error = True
+        if not error:
+            full_email = f"{self.email}@{self.domain}"
+            if not self.is_email_valid(full_email):
+                error = True
 
         pw1 = self.request.form.get("password1")
         pw2 = self.request.form.get("password2")