退信解释

退信解释：

    产生退信的原因有多种多样，下面根据您接收到退信中的关键字，来查找一下可能的原因。

 

退信信息	错误类型	问题原因及解决办法
User not found	550	收件人地址有错误 收件人地址错误或处于不可用状态，请检查收件人拼写或其它方式联系收件人
Recipient address rejected: Quota exceeded or service disabled	550
Mailbox not found	550
This user doesn't have a ×××× account	554
The email account that you tried to reach does not exist	550
mailbox unavailable	550
user not exist	550
User unknown in local recipient table	550
Invalid User	550
mail size or count over quota	552	收件人邮箱空间不足 收件箱或邮件超空间限制，请用其它方式联系收件人或稍后再试
Mailbox has exceeded the limit	552
quota exceed	552
Mailbox Is Full	552
message size ×××× exceeds size limit ×××× of server mail	552	邮件大小超出限制 邮件大小、附件大小超出收件服务器限制，减小邮件大小后再试
mail size or count over quota	552
Your message attachment exceeds ×××× limits	554
mail rejected by antispam server	550	邮件被对方服务器拒绝 邮件被收件方服务器判为了垃圾邮件，向邮件管理员反馈或用其它方式联系收件人
this mail is blocked by kbas system	553
sender reject	553
Service unavailable	554
Your access to this mail system has been rejected due to the sending MTA's poor reputation	554
Too many concurrent SMTP connections; please try again later	421
System busy now, please come back later	451	邮件服务器服务异常 邮件服务器服务异常(或反垃圾策略限制原因)，稍后再试或向管理员反馈
Service not available - too busy	421
Resources temporarily unavailable. Please try again later	451