diff --git a/internal/adapters/ui/validation.go b/internal/adapters/ui/validation.go
index 248c7d6..fea6bf5 100644
--- a/internal/adapters/ui/validation.go
+++ b/internal/adapters/ui/validation.go
@@ -150,7 +150,7 @@ func GetFieldValidators() map[string]fieldValidator {
 		Message:  "Port must be between 1 and 65535",
 	}
 	validators["User"] = fieldValidator{
-		Pattern: regexp.MustCompile(`^[a-zA-Z][a-zA-Z0-9._-]*$`),
+		Pattern: regexp.MustCompile(`^[a-zA-Z][a-zA-Z0-9._\-@:]*$`),
 		Message: "User must start with a letter and contain only letters, numbers, dots, hyphens, and underscores",
 	}
 	validators["Keys"] = fieldValidator{