在日常处理邮件问题的时候，经常会碰到退信情况，如下截图是常规退信判断问题方法。
| 503 | Error :password out of date | 密码过期 |
| 551 | Rejected login by smtp | 登陆方式限制 |
| 552 | Rejected restrict send | 禁用发送 |
| 553 | Rejected loginip | 登录ip限制 |
| 554 | Rejected,can't send to outdomain | 禁止给外域邮箱发送邮件 |
| 555 | Rejected,restrict send to appointed domain | 禁止用户发送邮件到指定域 |
| 556 | Rejected,only can send to appointed domain | 只允许用户发送邮件到指定域 |
| 557 | Rejected,recipient nums exceed limit | 最多收件人数限制 |
| 558 | Rejected,can't receive outdomain | 禁止接收外域发来的邮件 |
| 559 | Rejected,mailsize exceed role_maxmail_size limit | 最大邮件大小 |
| 560 | send ip length error | 加速器传递MUA IP有误 |
| 570 | ip address in addr blacklist | 发件人IP在地址本系统黑名单中 |
| 571 | domain address in addr blacklist | 发件人域名在地址本系统黑名单中 |
| 572 | sender address in addr blacklist | 发件人邮箱在地址本系统黑名单中 |
| 591 | This User has too many concurrents please try again later | ip connect并发超限 |
| 592 | This User has too many concurrents please try again later | ip connect频率超限 |
| 598 | ip address in blacklist | ip黑名单 |
| 550 | ip in prison | ip 在监狱中 |
| 550 | login name auth error rate limit exceeded | 登陆失败数超限 |
| 550 | This User has too many concurrents please try again later | sender频率超限 |
| 593 | This User has too many concurrents please try again later | sender并发超限 |
| 598 | sender in sender blacklist | sender黑名单 |
| 598 | sender in sender domain blacklist | sender domain黑名单 |
| 510 | sender cannot send mail to other domain | 禁止发外域 |
| 520 | recipient cannot receive mail from other domain | 禁止收外域 |
| 598 | maillist rejected | 禁止发list |
| 594 | This User has too many concurrents please try again later | ip rcpt频率超限 |
| 595 | This User has too many concurrents please try again later | ip rcpt error 超限 |
| 596 | This User has too many concurrents please try again later | sender rcpt error 超限 |
| 597 | Licence account exceed | Licence账户超限 |
| 598 | mail size exceeds limit | 邮件大小超限 |
| 598 | mail rejected by keyword | 关键字拒信 |
| 554 | Sender address rejected Access denied | 在access中 拒信 |
| 598 | |ip|address|in|blacklist|for|more|details|Please|see|http://211.150.100.59:8083/blacklist/blacklist.htm?ip= | ip 黑名单 |
| 598 | mail from and data from mismatch | 伪造发件人 拒信 |
| 598 | rate of recurrent pattern exceeded | 复发率超限 拒信 |
| 598 | spam detected | abs检测垃圾 拒信 |
| 598 | virus detected | 病毒邮件 拒信 |
| 503 | Error :password out of date | 密码过期 |
| 551 | Rejected login by smtp | 登陆方式限制 |
| 552 | Rejected restrict send | 禁用发送 |
| 553 | Rejected loginip | 登录ip限制 |
| 554 | Rejected,can't send to outdomain | 禁止给外域邮箱发送邮件 |
| 555 | Rejected,restrict send to appointed domain | 禁止用户发送邮件到指定域 |
| 556 | Rejected,only can send to appointed domain | 只允许用户发送邮件到指定域 |
| 557 | Rejected,recipient nums exceed limit | 最多收件人数限制 |
| 558 | Rejected,can't receive outdomain | 禁止接收外域发来的邮件 |
| 559 | Rejected,mailsize exceed role_maxmail_size limit | 最大邮件大小 |
| 560 | send ip length error | 加速器传递MUA IP有误 |
| 570 | ip address in addr blacklist | 发件人IP在地址本系统黑名单中 |
| 571 | domain address in addr blacklist | 发件人域名在地址本系统黑名单中 |
| 572 | sender address in addr blacklist | 发件人邮箱在地址本系统黑名单中 |
| 591 | This User has too many concurrents please try again later | ip connect并发超限 |
| 592 | This User has too many concurrents please try again later | ip connect频率超限 |
| 598 | ip address in blacklist | ip黑名单 |
| 550 | ip in prison | ip 在监狱中 |
| 550 | login name auth error rate limit exceeded | 登陆失败数超限 |
| 550 | This User has too many concurrents please try again later | sender频率超限 |
| 593 | This User has too many concurrents please try again later | sender并发超限 |
| 598 | sender in sender blacklist | sender黑名单 |
| 598 | sender in sender domain blacklist | sender domain黑名单 |
| 510 | sender cannot send mail to other domain | 禁止发外域 |
| 520 | recipient cannot receive mail from other domain | 禁止收外域 |
| 598 | maillist rejected | 禁止发list |
| 594 | This User has too many concurrents please try again later | ip rcpt频率超限 |
| 595 | This User has too many concurrents please try again later | ip rcpt error 超限 |
| 596 | This User has too many concurrents please try again later | sender rcpt error 超限 |
| 597 | Licence account exceed | Licence账户超限 |
| 598 | mail size exceeds limit | 邮件大小超限 |
| 598 | mail rejected by keyword | 关键字拒信 |
| 554 | Sender address rejected Access denied | 在access中 拒信 |
| 598 | |ip|address|in|blacklist|for|more|details|Please|see|http://211.150.100.59:8083/blacklist/blacklist.htm?ip= | ip 黑名单 |
| 598 | mail from and data from mismatch | 伪造发件人 拒信 |
| 598 | rate of recurrent pattern exceeded | 复发率超限 拒信 |
| 598 | spam detected | abs检测垃圾 拒信 |
| 598 | virus detected | 病毒邮件 拒信 |
| 503 | Error :password out of date | 密码过期 |
| 551 | Rejected login by smtp | 登陆方式限制 |
| 552 | Rejected restrict send | 禁用发送 |
| 553 | Rejected loginip | 登录ip限制 |
| 554 | Rejected,can't send to outdomain | 禁止给外域邮箱发送邮件 |
| 555 | Rejected,restrict send to appointed domain | 禁止用户发送邮件到指定域 |
| 556 | Rejected,only can send to appointed domain | 只允许用户发送邮件到指定域 |
| 557 | Rejected,recipient nums exceed limit | 最多收件人数限制 |
| 558 | Rejected,can't receive outdomain | 禁止接收外域发来的邮件 |
| 559 | Rejected,mailsize exceed role_maxmail_size limit | 最大邮件大小 |
| 560 | send ip length error | 加速器传递MUA IP有误 |
| 570 | ip address in addr blacklist | 发件人IP在地址本系统黑名单中 |
| 571 | domain address in addr blacklist | 发件人域名在地址本系统黑名单中 |
| 572 | sender address in addr blacklist | 发件人邮箱在地址本系统黑名单中 |
| 591 | This User has too many concurrents please try again later | ip connect并发超限 |
| 592 | This User has too many concurrents please try again later | ip connect频率超限 |
| 598 | ip address in blacklist | ip黑名单 |
| 550 | ip in prison | ip 在监狱中 |
| 550 | login name auth error rate limit exceeded | 登陆失败数超限 |
| 550 | This User has too many concurrents please try again later | sender频率超限 |
| 593 | This User has too many concurrents please try again later | sender并发超限 |
| 598 | sender in sender blacklist | sender黑名单 |
| 598 | sender in sender domain blacklist | sender domain黑名单 |
| 510 | sender cannot send mail to other domain | 禁止发外域 |
| 520 | recipient cannot receive mail from other domain | 禁止收外域 |
| 598 | maillist rejected | 禁止发list |
| 594 | This User has too many concurrents please try again later | ip rcpt频率超限 |
| 595 | This User has too many concurrents please try again later | ip rcpt error 超限 |
| 596 | This User has too many concurrents please try again later | sender rcpt error 超限 |
| 597 | Licence account exceed | Licence账户超限 |
| 598 | mail size exceeds limit | 邮件大小超限 |
| 598 | mail rejected by keyword | 关键字拒信 |
| 554 | Sender address rejected Access denied | 在access中 拒信 |
| 598 | |ip|address|in|blacklist|for|more|details|Please|see|http://211.150.100.59:8083/blacklist/blacklist.htm?ip= | ip 黑名单 |
| 598 | mail from and data from mismatch | 伪造发件人 拒信 |
| 598 | rate of recurrent pattern exceeded | 复发率超限 拒信 |
| 598 | spam detected | abs检测垃圾 拒信 |
| 598 | virus detected | 病毒邮件 拒信 |
| 503 | Error :password out of date | 密码过期 |
| 551 | Rejected login by smtp | 登陆方式限制 |
| 552 | Rejected restrict send | 禁用发送 |
| 553 | Rejected loginip | 登录ip限制 |
| 554 | Rejected,can't send to outdomain | 禁止给外域邮箱发送邮件 |
| 555 | Rejected,restrict send to appointed domain | 禁止用户发送邮件到指定域 |
| 556 | Rejected,only can send to appointed domain | 只允许用户发送邮件到指定域 |
| 557 | Rejected,recipient nums exceed limit | 最多收件人数限制 |
| 558 | Rejected,can't receive outdomain | 禁止接收外域发来的邮件 |
| 559 | Rejected,mailsize exceed role_maxmail_size limit | 最大邮件大小 |
| 560 | send ip length error | 加速器传递MUA IP有误 |
| 570 | ip address in addr blacklist | 发件人IP在地址本系统黑名单中 |
| 571 | domain address in addr blacklist | 发件人域名在地址本系统黑名单中 |
| 572 | sender address in addr blacklist | 发件人邮箱在地址本系统黑名单中 |
| 591 | This User has too many concurrents please try again later | ip connect并发超限 |
| 592 | This User has too many concurrents please try again later | ip connect频率超限 |
| 598 | ip address in blacklist | ip黑名单 |
| 550 | ip in prison | ip 在监狱中 |
| 550 | login name auth error rate limit exceeded | 登陆失败数超限 |
| 550 | This User has too many concurrents please try again later | sender频率超限 |
| 593 | This User has too many concurrents please try again later | sender并发超限 |
| 598 | sender in sender blacklist | sender黑名单 |
| 598 | sender in sender domain blacklist | sender domain黑名单 |
| 510 | sender cannot send mail to other domain | 禁止发外域 |
| 520 | recipient cannot receive mail from other domain | 禁止收外域 |
| 598 | maillist rejected | 禁止发list |
| 594 | This User has too many concurrents please try again later | ip rcpt频率超限 |
| 595 | This User has too many concurrents please try again later | ip rcpt error 超限 |
| 596 | This User has too many concurrents please try again later | sender rcpt error 超限 |
| 597 | Licence account exceed | Licence账户超限 |
| 598 | mail size exceeds limit | 邮件大小超限 |
| 598 | mail rejected by keyword | 关键字拒信 |
| 554 | Sender address rejected Access denied | 在access中 拒信 |
| 598 | |ip|address|in|blacklist|for|more|details|Please|see|http://211.150.100.59:8083/blacklist/blacklist.htm?ip= | ip 黑名单 |
| 598 | mail from and data from mismatch | 伪造发件人 拒信 |
| 598 | rate of recurrent pattern exceeded | 复发率超限 拒信 |
| 598 | spam detected | abs检测垃圾 拒信 |
| 598 | virus detected | 病毒邮件 拒信 |
| 503 | Error :password out of date | 密码过期 |
| 551 | Rejected login by smtp | 登陆方式限制 |
| 552 | Rejected restrict send | 禁用发送 |
| 553 | Rejected loginip | 登录ip限制 |
| 554 | Rejected,can't send to outdomain | 禁止给外域邮箱发送邮件 |
| 555 | Rejected,restrict send to appointed domain | 禁止用户发送邮件到指定域 |
| 556 | Rejected,only can send to appointed domain | 只允许用户发送邮件到指定域 |
| 557 | Rejected,recipient nums exceed limit | 最多收件人数限制 |
| 558 | Rejected,can't receive outdomain | 禁止接收外域发来的邮件 |
| 559 | Rejected,mailsize exceed role_maxmail_size limit | 最大邮件大小 |
| 560 | send ip length error | 加速器传递MUA IP有误 |
| 570 | ip address in addr blacklist | 发件人IP在地址本系统黑名单中 |
| 571 | domain address in addr blacklist | 发件人域名在地址本系统黑名单中 |
| 572 | sender address in addr blacklist | 发件人邮箱在地址本系统黑名单中 |
| 591 | This User has too many concurrents please try again later | ip connect并发超限 |
| 592 | This User has too many concurrents please try again later | ip connect频率超限 |
| 598 | ip address in blacklist | ip黑名单 |
| 550 | ip in prison | ip 在监狱中 |
| 550 | login name auth error rate limit exceeded | 登陆失败数超限 |
| 550 | This User has too many concurrents please try again later | sender频率超限 |
| 593 | This User has too many concurrents please try again later | sender并发超限 |
| 598 | sender in sender blacklist | sender黑名单 |
| 598 | sender in sender domain blacklist | sender domain黑名单 |
| 510 | sender cannot send mail to other domain | 禁止发外域 |
| 520 | recipient cannot receive mail from other domain | 禁止收外域 |
| 598 | maillist rejected | 禁止发list |
| 594 | This User has too many concurrents please try again later | ip rcpt频率超限 |
| 595 | This User has too many concurrents please try again later | ip rcpt error 超限 |
| 596 | This User has too many concurrents please try again later | sender rcpt error 超限 |
| 597 | Licence account exceed | Licence账户超限 |
| 598 | mail size exceeds limit | 邮件大小超限 |
| 598 | mail rejected by keyword | 关键字拒信 |
| 554 | Sender address rejected Access denied | 在access中 拒信 |
| 598 | |ip|address|in|blacklist|for|more|details|Please|see|http://211.150.100.59:8083/blacklist/blacklist.htm?ip= | ip 黑名单 |
| 598 | mail from and data from mismatch | 伪造发件人 拒信 |
| 598 | rate of recurrent pattern exceeded | 复发率超限 拒信 |
| 598 | spam detected | abs检测垃圾 拒信 |
| 598 | virus detected | 病毒邮件 拒信 |