Sendmail remote connection refused 解法

原文 http://www.electrictoolbox.com/article/sendmail/remote-connection-refused/

狀況：
telnet mail01 25
telnet: connect to address 192.168.1.10: Connection refused

解法：
修改 sendmail.cf，將這一行 mark 掉，再 restart sendmail。
# O DaemonPortOptions=Port=smtp,Addr=127.0.0.1, Name=MTA