[Sendmail]動作確認

1. mail コマンドで送信

   $ mail user@localhost
   Subject: Test mail
   This is test mail.
   .         ← サイドにピリオドを押して終了
   EOT

2. 受信確認

   $ cat /var/mail/user
   From user@localhost.localdomain Sun Nov 29 01:59:31 2009
   Return-Path: <user@localhost.localdomain>
   
   (中略)
   
   To: user@localhost.localdomain
   Subject: Test mail
   User-Agent: Heirloom mailx 12.4 7/29/08
   MIME-Version: 1.0
   Content-Type: text/plain; charset=us-ascii
   Content-Transfer-Encoding: 7bit
   
   This is test mail.