==== Required information ====
- iRedMail version: 0.8
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Debian Squeeze
- Related log if you're reporting an issue:
====
Mail Sever adds below header in outgoing messages.
is it really neccesary?

~~~~~~~~~~~~~~~
Received: from host.mydomain.com ([127.0.0.1])
          by localhost (host.mydomain.com [127.0.0.1]) (amavisd-new, port 10024)
          with ESMTP id 3PNfJz2xay6N for <you@gmail.com>;
          Sun, 28 Oct 2012 21:14:41
~~~~~~~~~~~~~~
The header resolves domain name as 127.0.0.1.
I heard SpamAssasin and some spam software do NOT like emails originating from
127.0.0.1 localhost.
My test mail to Hotmail went to Spam box.
Though, I hv SPF and DKIM included.

SpamAssassin v3.3.1 (2010-03-16)
Result:         ham  (-2.0 points, 5.0 required)