目前的问题是，发送邮件时，提示 SMTP 错误 (550): 添加收件人失败 "595139352@qq.com" (5.1.0 <test@dili.mrfresh.com>: Sender address rejected: User unknown in local recipient table)。
maillog如下：
roundcube: <2tidoeu5> SMTP Error: Failed to add recipient '595139352@qq.com'. 5.1.0 <test@dili.mrfresh.com>: Sender address rejected: User unknown in local recipient table (Code: 550) in /opt/www/roundcubemail-1.3.8/program/lib/Roundcube/rcube.php on line 1667 (POST /mail/?_task=mail&_unlock=loading1564402202391&_lang=en&_framed=1&_action=send)
Jul 29 20:09:54 mail postfix/submission/smtpd[13817]: disconnect from dili.mrfresh.com[127.0.0.1]
附件为配置文件。mx a 记录都做了。内网外网都做了。应该是配置文件问题。但是改了好久。还是没改对。谁有遇见的情况，还请告知。不胜感激！！！