最近用gmail时发现有几封不能寄，
是显示：
Delivery to the following recipient failed permanently:
****@********.tw
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for
the recipient domain *******.com.tw by parmail1.fr.publicisgroupe.net.
[81.200.177.120].
The error that the other server returned was:
550 #5.1.0 Address rejected.
我查了一下是SMTP Error，
不过我不了解这是什么；
也有说是对方将我加入黑名单，
但我不是寄广告信，之前也没发过信给她，
但我不知如何修改，请问要怎样才能寄信．
谢谢^^