How to stop receiving spam messages blindly addressed to user "admin"?

I've done a bit of searching but can't seem to find any relevant posts, so I'm hoping someone can be of help.
I'm using MacOS X Server 10.2.4. My user account on the server is "alan", and I set it up in Workgroup Manager so that all email addressed to me at "[email protected]" is automatically forwarded to my pacbell.net address. All that is working fine.
However, when I check my email at my pacbell.net address, in addition to the forwarded mail addressed to "[email protected]", I am also getting a lot of spam addressed to "[email protected]". Evidently, many spammers will just blindly spam "[email protected]" assuming that it will be a valid account. So what appears to be happening is since my user "alan" on the server is also an administrator account, there is some sort of default alias connecting the user "admin" to "alan", which in turn is causing me to receive the spam messages. They must be blind, because I've never used or referenced the address "[email protected]" anywhere.
So, the big question is --- how can I delink the alias "admin" from "alan"? It does not appear as a shortname in the Workgroup Manager under the user "alan", so I can't delete the alias there. I'm guessing there's probably a file somewhere I need to edit to do this, but can't seem to find it? I would be fine with redirecting mail addressed to "admin" to a null account that doesn't have email active, so those messages will just bounce back to the spammers.
Alternatively, is it possible to simply reject all mail sent to "[email protected]"?
Any help is appreciated!
Many thanks in advance,
Alan

David,
That would make sense, since user "alan" is definitely a member of the group "admin".
I see that sendmail is installed on the system, though I'm not sure that sendmail is in fact what is running the mail sever (although it could be).
I discovered this much at least -- the command to start the mail server is:
/usr/sbin/MailService-autostart on
So it would seem that "MailService" might be the name of the server app, or something to that effect. If so, how can I modify its configuration files to avert this behavior? Or is there some way to blanket reject all mail send to "admin"? (sorry if I've been repetitive) ...

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