參考至:https://help.aliyun.com/knowledge_detail/36605.html#企业邮箱常见错误提示
421 Service not available, closing transmission channel
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服务或网络出现异常,请您30分钟后再测试
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526 Authentication failure
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请您检查发信服务器需要身份验证是否勾选
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524 username or passwd is NULL
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请您检查帐号和密码是否正确,核实准确后再测试
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523 cipher text is invalid base64 format
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请您调整编码格式后再做尝试
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450 \"MAIL FROM\" mailbox unavailable
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请检查对方的邮箱账号是否拼写错误,再尝试发信
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552 \"RCPT TO\" mailbox unavailable
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请确认一下收件人账号是否正常可接收邮件状态
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451 Requested action aborted: local error in processing
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请检查您本地的终端是否存在问题,建议重启服务再发送
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504 the number of RCPT attempts is achieved the maximum threshold
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抱歉,您的发件数量已超过上限,请限制发信的数量
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505 the total of RCPTs is achieved the maximum threshold
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抱歉,您的发信频率已超过限制,请做降低调整
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550 mailbox is full
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抱歉,收件人的邮箱已满,请通知对方做邮件清理后再发送
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510 The length of DATA content is achieved the maximum threshold
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抱歉,邮件正文超过字数上限,请适当减少正文内容再发送
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510 The length of Attach is achieved the maximum threshold
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抱歉,邮件附件大小超过最大的限制,请适当调整后再发送
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510 The number of attachments is achieved the maximum threshold
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抱歉,附件数量超过上限,请减少附件数量再发送
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551 virus infected mail rejected
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该邮件可能带有木马或病毒,请对邮件进行杀毒再发送
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534 Message is too long
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抱歉,邮件正文超过字数上限,请适当减少正文内容再发送
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521 5.2.1 \: AOL will not accept delivery of this message.
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收件方服务器拒收此邮件,反馈给收件方的邮箱服务商获取帮助
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554 Reject by behaviour spam
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由于发送频率过高,被反垃圾组织屏蔽,请等待解封后再发送
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554 Reject by content spam
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由于邮件内容被反垃圾屏蔽,请检查调整内容后再发送
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451 Requested action aborted: local error in processing
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请检查您本地的终端是否存在问题,建议重启服务再发送
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400 Temporary failure
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抱歉,连接失败,请尝试重新发送
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Reject Virus Infected Mail551 virus infected mail rejected
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邮件含有病毒,请清理邮件内容后重试投递
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resolving by dns failed
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对方域名无法解析,请确认对方域名正常后重试投递
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57 This email is rejected. It contains keywords rejected by the antispam content filter
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发送的邮件内容,命中了对方反垃圾系统中的关键字;调整邮件内容后重试投递
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521 5.2.1 : AOL will not accept delivery of this message
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对方邮箱不允许接收所发邮件的内容; 建议用户发送简单的测试邮件内容给对方看是否可以投递成功;
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451 Temporary local problem - please try later
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收件方服务器临时异常,导致邮件投递失败; 解决方法:重试投递,还无效,需联系收件人邮箱服务商确认
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550 Message is too large /Too large/Maximum fixed size/ 552 Message size exceeds fixed limit
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邮件体积过大,超过对方接收单个邮件最大限制。 请将要发送的邮件拆分发送
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550 5.7.1 Service unavailable; Client host [x.x.x.x] blocked using Trend Micro RBL+
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退信原因:发现方外发IP被收件方反垃圾启用系统列入黑名单; 解决方法:发起工单,由云邮箱服务商申请解封
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Recipient address rejected: User unknown in virtual mailbox table (in reply to RCPT TO command)
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退信原因:对方服务器系统中没有找到此收件邮箱地址; 解决方法:请重新核实对方邮件地址的准确性后重试投递。
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