我有两台服务器：
在服务器1中，IP：192.168.190.176，我已经配置main.cf
myhostname = ubuntu
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = ubuntu, 192.168.190.171.ubuntu, 192.168.190.171
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
在 server2 中，IP：192.168.190.171，我已配置如下：
myhostname = ubuntu
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = ubuntu, 192.168.190.176.ubuntu, 192.168.190.176
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
当我通过命令从server1向server2发送邮件时：
echo "Test" | mail -s "Test Postfix" quocchi@[192.168.190.171]
在server2中，/var/spool/mail/quocchi是空的。
在server1中：/var/log/mail.log
Apr 23 17:37:27 ubuntu postfix/qmgr[3452]: 17902800A9: from=<root@ubuntu>, size=311, nrcpt=1 (queue active)
Apr 23 17:37:27 ubuntu postfix/local[3465]: 17902800A9: to=<quocchi@ubuntu>, relay=local, delay=0.34, delays=0.15/0.15/0/0.05, dsn=2.0.0, status=sent (delivered to mailbox)
Apr 23 17:37:27 ubuntu postfix/qmgr[3452]: 17902800A9: removed
在服务器2中：
Apr 23 19:35:59 ubuntu postfix/smtpd[10688]: lost connection after CONNECT from unknown[192.168.190.17$
Apr 23 19:35:59 ubuntu postfix/smtpd[10688]: disconnect from unknown[192.168.190.176]
我该如何正确设置它？