We have a Dedicated server with two domains running on it, let's say:

aaa.com (=primary domain)   and
bbb.com (=secondary domain)

By default Lunarpages sets up only ONE Mail Server for these two domains.
This mail server is always assigned to the primary domain (here: aaa.com)

For most of our eMails this scenario works fine.

However some clients who receive eMails from us with an eMail address
...@bbb.com identify them as Spam.

This occurs because the sending mail server (=aaa.com) does NOT fit to the
sending email domain (=bbb.com). In the header field on the recipients side the sending
server appears as

Received: from [125.103.233.172] (helo=your531abaa355)
   by server.aaa.com with esmtpsa (TLSv1:RC4-MD5:128)
   (Exim 4.63)
   (envelope-from <info@bbb.com>)
   id 1HHJpx-0005nj-23

Hmm, what kind of solution are for this kind of problem?

Can we setup a second eMail server?

Or can we configure the first (and only) mail server so that it identifies himself
depending on the sending eMail domain ?

Maybe there is another solution....

Peter

Again, I agree with you that identifying such eMails as spam is unusual.

However there are some important companies whose (unknown) spam software
bounce these eMails. One example: Well known "Nortel Networks" sends back those
eMails with the following remarks (I anonymized some personal values):


email bounce body:
----
This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  xxxxxxx@nortel.com
    SMTP error from remote mail server after end of data:
    host ertph000.nortel.com [47.234.0.40]: 550 209.200.236.242 blocked. - by our email filters - If you believe this to be in error, please forward this whole bounce (including Session ID:
    1171467698.03023523) to filtops@nortel.com ONLY
----

So obviously the Nortels spam software blocked such eMails.

Again the question: What can we do?