diff --git a/web/service/inbound.go b/web/service/inbound.go
index 5213fce6..822a4e8d 100644
--- a/web/service/inbound.go
+++ b/web/service/inbound.go
@@ -2024,6 +2024,7 @@ func (s *InboundService) GetOnlineClients() []string {
 }
 
 func validateEmail(email string) (bool, error) {
+
 	if strings.Contains(email, " ") {
 		return false, errors.New("email contains spaces, please remove them")
 	}
@@ -2032,6 +2033,11 @@ func validateEmail(email string) (bool, error) {
 		return false, errors.New("email contains uppercase letters, please convert to lowercase")
 	}
 
+	nonEnglishPattern := `[^\x00-\x7F]`
+	if regexp.MustCompile(nonEnglishPattern).MatchString(email) {
+		return false, errors.New("email contains non-English characters, please use only English")
+	}
+
 	emailPattern := `^[a-z0-9@._-]+$`
 	if !regexp.MustCompile(emailPattern).MatchString(email) {
 		return false, errors.New("email contains invalid characters, please use only lowercase letters, digits, and @._-")