diff --git a/proxy/vmess/validator.go b/proxy/vmess/validator.go
index bf64d98a..30884396 100644
--- a/proxy/vmess/validator.go
+++ b/proxy/vmess/validator.go
@@ -186,10 +186,9 @@ func (v *TimedUserValidator) Remove(email string) bool {
 	v.Lock()
 	defer v.Unlock()
 
-	email = strings.ToLower(email)
 	idx := -1
-	for i, u := range v.users {
-		if strings.EqualFold(u.user.Email, email) {
+	for i := range v.users {
+		if strings.EqualFold(v.users[i].user.Email, email) {
 			idx = i
 			var cmdkeyfl [16]byte
 			copy(cmdkeyfl[:], u.user.Account.(*MemoryAccount).ID.CmdKey())