網路設定
WAN介面設定
主機名稱
不能為 localhost.localdomain
必須為正確的 FQDN Domain
主機名稱必須正確設定 , 例如 : yourdomain.com 或 mail.yourdomain.com, 設定前請先用 ping 指令 確定你要指定的這個主機名稱 , 所解釋到的 IP 和你的伺服器IP相同 , 不正確的設定將會造成伺服器某些功能不正常 , 例如 FTP , 伺服器轉寄重寄 , 群組帳號失效 , 信件遺失 ...等問題.
被丟到廣告信箱
被當成垃圾信
Subject: Undelivered Mail Returned to Sender
This is the mail system at host localhost.localdomain.
I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can delete your own text from the attached returned message.
The mail system