发送邮件是生活工作中最常见不过的事情了，但是在这个过程中，很多人都碰到过发送错误，本文给列举了这些常见的错误和解决方法，希望对大家有所帮助。
错误1
550 Mail content denied
这种是内容的问题，用户加服务器IP白名单就可以了。
错误2
550 Connection denied
出错原因：该服务器IP的发信频率大幅度超过QQ邮箱限制。
错误3
550 Connection frequency limited
出错原因：该服务器IP的发信频率超过腾讯邮箱限制。
错误4
550 5.5.0 Invalid EHLO/HELO domain
原因：邮箱不存在
错误5
status=deferred
用户把我们发送邮件当作垃圾邮件过滤掉了
错误6
host xxx.mail.eo.outlook.com[xxx.xxx.163.247] said: 550 5.7.1 Service unavailable; Client host [xxx.xxx.xxx..16] blocked using FBLW15; To request removal from this list please forward this message to delist@messaging.microsoft.com (in reply to RCPT TO command)
客户的邮件系统是Exchange，不知微软的过滤规则为何挡了邮件，为了让微软把我们移出黑名单，只能给他们发邮件申诉了，delist@messaging.microsoft.com，申诉邮件内容：
Please Help me out to solve the belowisuue. My Below IP Address are showing Blacklisted on below dns address IP Address:IP xxx.xxx.xxx.xxx . Please Help me and removemy ip from black list Thank you! xxxxx
十分钟以后，会收到微软回复的邮件：
Hello , Thank you for your delisting request SRX1251909371ID. Your ticket was received on (Jun 25 2014 07:59 AM UTC) and will be responded to within 24 hours. Our team will investigate the address that you have requested to be removed from our blocklist. If for any reason we are not able to remove your address, one of our technical support representatives will respond to you with additional information. Regards, Technical Support
耐心等待微软恢复你的邮件白名单。
错误7
status=bounced (host mx54.dns.com.cn[220.181.130.176]said: 550 Does not like recipient,your mail is rejected! (in reply to end of DATA command)); sender non-delivery notification: F20F2DD80FC;removed
出错原因：对方某一台收件服务器当时正处在繁忙之中或者我们的服务器和对方链接并不是很顺畅。
解决方法：有可能是暂时的情况，用别的地址测试一下，看看是否被退信，或者过一段时间再发送一下。
错误8
1）status=bounced(hostmx3.qq.com[183.60.2.53]said:550Mailboxnotfound.http://service.mail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000728 (in reply to RCPT TO command)); sender non-delivery notification: 9CC7FDD8084; removed 2）status=bounced (host 163mx01.mxmail.netease.com[220.181.12.62] said: 550 User not found: cjld@163.com (in reply to RCPT TO command)); sender non-delivery notification: 8FD7CA00013A; removed
出错原因：收件人地址不存在或者收件人地址写错
解决方法：核对地址后重新发送
错误9
status=deferred(hostmxzwg4.mxhichina.com[58.68.254.104]said:450MI:IPBhttp://www.net.cn/service/faq/youx/mailsy/200905/3781.html (in reply to MAIL FROM command))
出错原因：450MI:IPB发信IP被暂时禁止，请检查是否有用户发送病毒或者垃圾邮件。
解决方法：联系您的企业邮箱运营商
错误10
status=deferred(connecttoapllo-zm.com[60.191.124.236]:25:Connectiontimedout);from=, size=24500463, nrcpt=2 (queue active);
解决方法：用nslookup查询对方邮箱服务器的ip地址，通过 telnet 对方服务器的25端口等方式确认是网络连接不正常还是由于对方服务器的25端口没有响应。一般说来，无论是网络故障还是对方系统故障，都能被对方系统管理员很快被发现和恢复，所以可以选择再次发送进行尝试。对于部分国外的邮件服务商，出现这种情况持续的时间会比较长，如果尝试超过1天都不能成功，建议先使用其他方式与收件人联系。
错误11
1）status=bounced (host sohumx1.sohu.com[220.181.26.202] said: 553 5.7.3 CONTENT REJECT:10.10.71.82.2011062016.XXD6ywq8:dspam check:5:http://mail.sohu.com/info/policy/12 (in reply to end of DATA command)); 2）Recipient address rejected: User unknown in local recipient table
出错原因：1）内容被拒绝，可能是收件人对所接收的邮件进行了设置，内容中含有特定词汇等会被拒绝；2）收件人地址被拒绝。
解决方法：核实对方是否对内容及账户进行了设置之后重新发送。
错误12
.Clienthostrejected: Access denied; from= to= proto=SMTP helo=
出错原因：客户端主机被拒绝。
解决方法：看一下客户端接收邮件服务器设置是否正确，“我的服务器需要身份验证”是否打钩，测试一下发信25口是否已连接。
错误13
status=bounced (host mx1.mail.cnb.yahoo.com[203.209.228.250] said: 554 delivery error: dd Sorry your message to weixing201314@yahoo.com.cn cannot be delivered. This account has been disabled or discontinued [#102]. - mta1004.mail.cnb.yahoo.com (in reply to end of DATA command)); sender non-delivery notification: 1C580DD80B4; removed
出错原因：对方账号被停用或者不可用。
解决方法：正常退信，换账号发送
错误14
9status=bounced (message size 24864357 exceeds size limit 10240000 of server cluster4.us.messagelabs.com[98.126.139.202]); sender non-delivery notification: C6A3BDD8078; removed
出错原因：邮件过大，超出对方单封邮件接收范围。
解决方法：对方换账号，重新发送。