1、ExtMail Pro: Content refuse internal reference code H (命中条件的ＩＤ号码)
管理后台设置了标题关键字过滤 ，邮件标题中有相应的关键字被拦截
2、 ExtMail Pro: Content refuse internal reference code C(命中条件的ＩＤ号码)
管理后台设置了内容关键字过滤 ，邮件正文中有相应的关键字被拦截
3、Reuqest not taken domain mismact!
发件人与认证信息不符
4、 ExtMail Pro:Request not taken blocked by ruled id (命中条件的ID号码)
管理后台添加了黑名单被拒
5、 ExtMail Pro:Request not taken blocked by access not allowed
邮件群组设置内部投递限制
6、ExtMail Pro:Request not taken blocked by mailbox access not allowed
管理后台设置了邮箱外发/接收限制
7、ExtMail Pro:Request not taken blocked by domain access not allowed
管理后台设置域外发/接收限制
8、 ExtMail Pro: Too much outgoing mail, try later
管理后台添加了触发频率限制
9、 ExtMail Pro : Fail Please see http://www.openspf.org/why.html?sender=
SPF：
为了提升域名邮箱发送外域邮件的成功率，建议您给自己的域名设置一条TXT记录来避免这种情况
10、 ExtMail Pro:tempory failure:(原因)
ExtMail Pro:You IP address [IP地址] rejected:blocked using by RBl
发件IP被列入国际组织黑名单
11、 ExtMail Pro:Greylist in action ,Please try later
Greylist ：灰名单发垃圾邮件机制，正常邮件系统如果接收到Greylist 提示系统会自动重新投递异常，
12、ExtMail Pro: Request not taken blocked by over message size limit (限制值) KB rule id (命中条件的ID 号码)
触发容量限制
13、 ExtMail Pro : Request not taken blocked by forge mail!
伪造邮件
14、ExtMail Pro : Request not taken sender block by rule id access not allowed
用户开启内部投递限制