fix return

utils/mail/imap.go

@@ -153,8 +153,9 @@ func ListenMail(mailAddress, folder, userName, password string, readBatchSize, f
 		// 获取邮件内容 End
 
 		// 获取规则
-		ruleJson, err := eta.GetBusinessConfByKey("MailCheckRule")
-		if err != nil {
+		ruleJson, e := eta.GetBusinessConfByKey("MailCheckRule")
+		if e != nil {
+			err = e
 			global.FILE_LOG.Error("获取规则配置失败：%v", err)
 			return
 		}