/etc/mail/sendmail.mc
127.0.0.1 -> 0.0.0.0
m4 sendmail.mc>sendmail.cf
==============================================

/etc/mail/access
192.168.224 RELAY
makemap hash access<access
==============================================

/etc/mail/local-host-names
pygm.edu.cn
================================
在XP下 telnet mail.pygm.edu.cn 25
 telnet mail.pygm.edu.cn 110