diff --git a/server/mailserver/mail/mailmgr.go b/server/mailserver/mail/mailmgr.go
index a07758d8..e06dcbae 100644
--- a/server/mailserver/mail/mailmgr.go
+++ b/server/mailserver/mail/mailmgr.go
@@ -297,6 +297,36 @@ func (this *mailMgr) CaSendMail(c *gin.Context) {
 			return
 		}
 	}
+	{
+		var dbErr error
+		found := false
+		f5.GetGoStyleDb().OrmSelectOne(
+			constant.MAIL_DB,
+			"t_mail",
+			[][]string{
+				{"unikey", reqJson.UniKey},
+			},
+			func (err error, ds *f5.DataSet) {
+				dbErr = err
+				if err == nil {
+					if ds.Next() {
+						found = true
+					}
+				}
+			});
+		if dbErr != nil {
+			rspObj.ErrCode = 500
+			rspObj.ErrMsg = dbErr.Error()
+			c.JSON(200, rspObj)
+			return
+		}
+		if found {
+			rspObj.ErrCode = 3
+			rspObj.ErrMsg = "mail already exists"
+			c.JSON(200, rspObj)
+			return
+		}
+	}
 	mailId := f5.GetApp().NewLockNodeUuid()
 	nowTime := f5.GetApp().GetRealSeconds()
 	f5.GetGoStyleDb().Insert(