Could he do something like use a .qmail file to pipe the message into a
script that would examine headers and then only deliver if the message was
from the local domain? I guess that the headers could be forged easily
enough to get around this, but at least if could be a plausible attempt.

> From: Mike Jackson <[EMAIL PROTECTED]>
> Date: Sat, 21 Apr 2001 22:01:10 +0300
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED]
> Subject: Re: aliases issue !!!
> 
> You can't restrict who can use aliases. Anyone who can send mail to your
> system can send mail to all aliases that exist on the system. If you
> convert the aliases to Ezmlm lists, you can restrict posting to
> subscribers and even moderate lists.
> 
> Mike

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