diff --git a/handler/tool.go b/handler/tool.go
index 14b24b6..a5192ef 100644
--- a/handler/tool.go
+++ b/handler/tool.go
@@ -441,7 +441,7 @@ func SendMail(title, content string) {
 	em.SmtpPort = 587
 	em.ImapPort = 993
 	var targetMails []string
-	for _, v := proto.Config.MONITOR_MAIL{
+	for _, v := range proto.Config.MONITOR_MAIL {
 		targetMails = append(targetMails, v.Value)
 	}
 	if targetMails == nil || len(targetMails) == 0 {