I am sorry to keep bringing this up, but I have tried everything and am not sure where to turn next!

The issue: one particular domain *appears* to be using me as a relay. The messages sit in my mailq and my log grows and grows. I have only a few actual users right now and I want to get this addressed before I get too many.

My smtpaccess file ONLY has allow,RELAYCLIENT for localhost and the IP I registered for my domain. My locals file only has localhost and my domain and my esmtpacceptmailfor also is localhost and my domain as is hosteddomains. My installation is nothing special nor have I made any drastic changes to anything.

Now, to be clear, I do not receive ANY spam from this domain or any other for that matter so I do not think this is a filtering issue, although it may be.

So I guess my question has a few options:

A.) How do I prevent this one domain from attempting to go through me and further HOW are they doing it?

B.) How can I set the mailq so it does not hold onto these emails thereby slowing MY mail down? NOTE: I am not asking how to remove all the messages, I know how to do that. :)

C.) Is there some place that I have not looked that I should be looking? Is this perhaps not even a courier issue but perhaps something in my system? (I don't think so but it does not hurt to consider it.)

I am running an LFS system with the 2.4.25 kernel.

Again I apologize for the continued whining and posting, but this is very frustrating to me and I would very much like to make it stop, so any help whatsoever, even if you think it is obscure, would be greatly appreciated.

Thanks in advance,