263常見退信解釋

550 user not exist：收信人地址不存在
550 mailbox limit exceeded：收信人郵箱已滿
550 mail size limit exceeded：發(fā)送的信件大小超過了對方的接收限制
550 sender in prision:發(fā)信人郵箱地址被臨時掛起
550 ip in prision：發(fā)信方ip地址被臨時掛起
520 ip and spf record not match：觸犯spf規(guī)則，郵件被拒收
554 Sender address rejected Access denied：觸犯同域認證規(guī)則，郵件被拒收
598 ip address in blacklist for more details：發(fā)信方服務器的ip地址在263接收服務器的黑名單中