My server has 3 domains: a.com
Whenever a message is sent from my server, the header will contain a line which says:
from myhomeaddress.com (HELO ?192.168.1.1?) (123.456.789.101) by a.com with (DHE-RSA-AES256-SHA encrypted) SMTP; 25 Apr 2006 06:45:41 -0700
The a.com part is what I have a problem with. That a.com will change at random to any of the domain names I have on my server. So sometimes it may send a.com in the header, while others it may send b.com or c.com. I'd like to stop this from happening. I know it can be done since:
echo To: firstname.lastname@example.org
sends an e-mail without that header line included. So somewhere in the qmail process, it gets added.
Does anyone know how to prevent this from happening?