Thank you,
The end result was very similar... It seems that sendmail.org was very helpful in this regard. Though most of the FAQ's and info that I found on the internet had me rewriting the sendmail.cf to make any kind of changes, I found that I didn't have to do any of that to get what I wanted to get done accomplished.
From what I found (and have tested and it works), the only thing I had to do was add a few lines to two different files (what made it worse was that those files didn't even exist in a standard RedHat 7.0 Installation so I had to figure out what they were). Those files were:
/etc/mail/access - in which I added the line:
mydomain.com RELAY
/etc/mail/mailertable - in which I added the lines:
mydomain.com esmtp:realmailserver.mydomain.com
.mydomain.com esmtp:realmailserver.mydomain.com
From what I found out, the access file overrides the default rule of no relaying, and the second file gives a specific location as the only place to try to deliver this queued mail - which was needed to resolve the issue that popped up - Error "553 - Config Error: Mail loops back to me (MX Problem?)"
From what I understand (and is, of course, possibly wrong) the /etc/mail/relay-domains file is for defining who is allowed to relay through the mail server out to the internet (like a local LAN addresses list), which ended up being exactly the opposite of what I wanted.
The end result was that I wanted ANYone to be able to relay through this mail server (as it is intended to be a secondary queueing server), as long as it was going TO a specific domain. And this is what I got. Thank you again
