我用redhat9.0架设了一个sendmail服务器，可为什么能发出邮件却不能收到邮件呢

everyday1700

# vi /etc/mail/sendmail.mc并找到如下两行
dnl TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
dnl define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')
将前面的"dnl"删除.再找到如下那行并作修改
DAEMON_OPTIONS(`Port=smtp,Addr=你的IP, Name=MTA')dnl
vi /etc/xinetd.d/imap
service imap
{
disable = no
socket_type = stream
wait = no
user = root
server = /usr/sbin/imapd
log_on_success += HOST DURATION
log_on_failure += HOST
}
[root@mis010 /]# vi /etc/xinetd.d/ipop3
service pop3
{
disable = no
socket_type = stream
wait = no
user = root
server = /usr/sbin/ipop3d
log_on_success += HOST DURATION
log_on_failure += HOST
}
[root@mis010 /]# vi /etc/xinetd.d/ipop2
service pop2
{
disable = no
socket_type = stream
wait = no
user = root
server = /usr/sbin/ipop2d
log_on_success += HOST DURATION
log_on_failure += HOST
}
这些我都配置了，但还是只能发出不能收到邮件，我是局域网内实验的，只高手指点