[Linux] 透過 alias 與 virtual 機制建立 no-reply @ hostname 帳號 @ Postfix 2.9.6, Ubuntu 12.04

新增一筆 alias 用來導向 /dev/null

$ grep alias_maps /etc/postfix/main.cf
alias_maps = hash:/etc/aliase
$ sudo vim /etc/aliases
...
devnull: /dev/null
...

採用 virtual account 新增 no-reply 帳號：

$ grep virtual_alias_maps /etc/postfix/main.cf
$ sudo vim /etc/postfix/main.cf
virtual_alias_maps = hash:/etc/postfix/virtual

$ sudo vim /etc/postfix/virtual
no-reply@hostname devnull

$ sudo newaliases
$ sudo postmap /etc/postfix/virtual
$ sudo postfix reload
postfix/postfix-script: refreshing the Postfix mail system

至於測試方式，就直接連他寄信看看：

$ telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 hostname ESMTP Postfix (Ubuntu)
HELO localhost
250 hostname
mail from:<root@localhost>
250 2.1.0 Ok
rcpt to:<no-reply@hostname>
250 2.1.0 Ok
quit
221 2.0.0 Bye
Connection closed by foreign host.

如果出現 451 4.3.0 <no-reply@hostname>: Temporary lookup failure ，請記得翻一下 /var/log/mail.err ，若是單純 error: open database /etc/postfix/virtual.db: No such file or directory 問題，記得跑一下 sudo postmap /etc/postfix/virtual 即可。