我作sendmail实验，一台服务器，一台客户机，服务器能发也能收，客户机能发信给服务器，服务器也能收到，但客户机不能收信，自己发给自己也收不到，发完后客户机用mailq检查为空，就是说发出去了，但收不到.服务器用mailq出现提示：deferred:connection refused by station1.example1.com(station1为客户机)

服务器（server1）：

/etc/sysconfig/network-scripts/ifcfg-eth0
device=eth0
bootproto=none
onboot=yes
ipaddr=192.168.100.10
netmask=255.255.255.0

/etc/hosts
127.0.0.1 localhost.localdomain localhost
192.168.100.10 server1.example1.com

/etc/resolv.conf
nameserver 192.168.100.10

/etc/sysconfig/network
networking=yes
hostnames=server1.example1.com

/etc/mail/local-host-names
server1.example1.com

/etc/mail/sendmail.cf
......
O DaemonPortOptions=Port=smtp,addr=192.168.100.10,Name=MTA
.......

/etc/mail/access
localhost.localdomain relay
localhost relay
127.0.0.1 relay
example1.com relay
station1.example1.com relay

DNS设置：

$TTL 86400
@ IN SOA server1.example1.com. root.server1.example1.com. (
2004121801 1H 1M 1W 1D )
IN NS server1.example1.com.
IN A 192.168.100.10
server1 IN A 192.168.100.10
station1 IN A 192.168.100.20
www IN A 192.168.100.10
ftp IN A 192.168.100.10
www1 IN CNAME server1.example1.com.
ftp1 IN CNAME server1.example1.com.
@ IN MX 10 server1.example1.com.
server1.example1.com IN MX 10 server1.example1.com.

$TTL 86400
@ IN SOA server1.example1.com. root.server1.example1.com. (
2004121801 1H 1M 1W 1D )
IN NS server1.example1.com.
10 IN PTR server1.example1.com.
20 IN PTR station1.example1.com.


客户机(station1)：
/etc/sysconfig/network-scripts/ifcfg-eth0
device=eth0
bootproto=none
onboot=yes
ipaddr=192.168.100.20
netmask=255.255.255.0

/etc/hosts
127.0.0.1 localhost.localdomain localhost
192.168.100.20 station1.example1.com

/etc/resolv.conf
nameserver 192.168.100.10

/etc/sysconfig/network
networking=yes
hostnames=station1.example1.com

/etc/mail/local-host-names
station1.example1.com

客户机的sendmail.cf,access没有改动（会不会有问题？）

配置后，服务器能发也能收信，但客户机只能发不能收：

用客户机给服务器发信：

telnet 192.168.100.10 25
.......
mail from:root@station1.example1.com
rcpt to:root@server1.example1.com
data
hello
........
在服务器收信：
more /var/mail/root
.....
hello
......
能收到

用客户机给自己发信
telnet 192.168.100.10 25
.......
mail from:root@station1.example1.com
rcpt to:root@station1.example1.com
data
hello
........
在客户机收信：
more /var/mail/root
.......
From: root@xxxx.com (Anacron)
To: root@xxxx.com
Subject: Anacron job 'cron.daily'
Status: RO

/etc/cron.daily/tripwire-check:

**** Error: Tripwire database for test.linux.net not found. ****
**** Run /etc/tripwire/twinstall.sh and/or tripwire --init. ****

.......

出现错误！收不到信，从服务器发信到客户机也是如此。另配一个客户机也一样。
DNS正常，iptables也关闭了，我怀疑我的配置漏掉了某个地方，尤其是客户机是不是还有什么地方没有配置？

请大家指点，谢谢！

你这个不存在客户机和服务器，是两个域的sendmail在相互发邮件
也就是说"客户机"的域是station1.example1.com
"服务器"的域是server1.example1.com
由于你的“客户机”(station1.example1.com)上的sendmail.mc没有更改所以“客户机”的监听端口还是127.0.0.1
把sendmail.mc里的DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl注释掉。然后用m4重新生成sendmail.cf