in /etc/postfix/main.cf , set myorigin=$mydomain and not as $myhostname.

From: Xia Guowen <xiagw@51poi.com>
To: centos@centos.org
Sent: Tuesday, February 24, 2009 2:07:38 PM
Subject: [CentOS] Mail from domain problem

Hi,

I installed a CentOS 4.7 server, the system information is:

# cat /etc/sysconfig/network

NETWORKING=yes
HOSTNAME=mail.domain11.com

# hostname

mail.domain11.com

#echo "test " | mail -s "test mail" someone@domain22.com

I would like to receive mail is root@domain11.com, but I received is root@mail.domain11.com

How to correct it?

(I've tested there is no problem in CentOS 5.2)

Best regards