553 Requested action not taken: no smtp MX only,mx5,keCowEDJyUsBDKZOV+k3AA--.11424S2 1319504897
发布时间：2013-11-28 10:32:59
| 错误代码 | 553 Requested action not taken: no smtp MX only,mx5,keCowEDJyUsBDKZOV+k3AA--.11424S2 1319504897 |
| 形成原因 | 同域认证问题 |
| 解决办法/流程 | 退信显示：发信服务器不允许客户使用mx机器发信，因为收件人也是域内用户，产生同域认证。
请核实收件人地址是否写错。123@abc.com.是否多了一个。 这样会导致您本地发信时服务器认为不是域内用户，选择用MX机器发信。 但是上传到MX机器后，MX机器检测是域内用户返回退信。 |
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