网易邮箱常见退信说明
网易退信代码说明：•421 HL:REP 该IP发送行为异常，存在接收者大量不存在情况，被临时禁止连接。请检查是否有用户发送病毒或者垃圾邮件 …
退信分析
500 Line too long
退信内容：500 Line too long 退信原因：被对方Watchguard反垃圾防火墙规则拦截 解决方案：Watchguard是一个 …
550 Sender has no A, AAAA, or MX DNS records
退信内容：550 Sender has no A, AAAA, or MX DNS records 退信原因：发信人域名没有A和MX记录等导 …
550 Relaying mail to 81170011@cptt.com.tw is not allowed
550 Relaying mail to 81170011@cptt.com.tw is not allowed 退信原因：对方邮箱不存在。 …
550 Relaying mail to 81170011@cptt.com.tw is not allowed 查看全文
554 mail server permanently rejected message (#5.3.0)
554 mail server permanently rejected message (#5.3.0) 退信原因：被对方服务器认定为垃圾 …
552 Sorry, your host is blocked by spam detection system
退信内容：552 Sorry, your host is blocked by spam detection system 退信原因：被对方 …
552 Sorry, your host is blocked by spam detection system 查看全文
554 5.7.1 Client host rejected: Access denied
554 5.7.1 Client host rejected: Access denied 退信原因：出现这个退信，需要具体分析，一般有下面 …
451 Failed to store message for
451 Failed to store message for 退信原因：远程服务器写入邮件失败 解决方案：这个问题，不是发送方的问题，是邮 …
550 5.7.1 message content rejected
550 5.7.1 message content rejected 退信原因：邮件内容被屏蔽 解决方案：出现这个问题，重复发送邮件是没有用 …
Could not connect to 0.0.0.0 on port 25 since this would mean connecting to myself
Could not connect to 0.0.0.0 on port 25 since this would mean connecti …
Could not connect to 0.0.0.0 on port 25 since this would mean connecting to myself 查看全文