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问题 |
解答 在预期的时间内从源服务器传送邮件到目的服务器失败,得到的"SMTP Protocol Returned a Transient Error"和"SMTP Protocol Returned a Permanent Error"错误的区别在于:Transient errors是暂时的, 而permanent errors是不可恢复的错误。 SMTP Protocol Returned a Transient Error 例如: "<MM/DD/YYYY> 05:37:42 PM Router: No messages transferred to ACME.COM Transient errors经常跟着4XX错误代码, 例如: "421 ritz.ACME.COM SMTP service not available, closing transmission channel" SMTP Protocol Returned a Permanent Error "<MM/DD/YYYY> 05:37:42 PM Router: No messages transferred to ACME.COM Permanent errors经常跟着5XX错误代码, 例如: "554 Connection from <spam.bogus.com> rejected for policy reasons. Host found in DNS blacklist at <blacklist>" |
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