yes, definately an MTA question..but..
if you have an external MX and an internal MX jsut block email for said
user at the external MX, which would fix this.
if not, then like other's said, a procmailrc, or piping to a script via
/etc/aliases. Off the top of my head, in the script you could check the
username part of the From: address for existance in your passwd file to
see if the sender is one of yours (assuming you use the passwd file)
although From addresses can be forged, you play the percentages i suppose.
Or you could try looking at the last Received: line to find an ip matching
one of your dialup IP subnets? *shrug*
It might be more work than it's worth. I don't know why you would want to
block everybody on the outside (of course that's up to you) but if it's
some sort of spam/abuse issue, better to go to the source I say.

-Tony
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Anthony J. Biacco                       Network Administrator/Engineer
[EMAIL PROTECTED]       Intergrafix Internet Services

    "Dream as if you'll live forever, live as if you'll die today"
http://www.asteroid-b612.org                http://www.intergrafix.net
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On Tue, 3 Jul 2001, Leighton Fehr wrote:

> Hi.
> I have QPopper 3.1.2 installed on my Linux RedHat 6.2 server.
> I am looking for a way to block email sent to one of my users and haven't
> been able to figure it out yet.  I want to block everybody, except the users
> on my mail server, from being able to send messages to a particular account.
> But I don't want to block access to the other accounts on my mail server.
> Is this possible with QPopper?  If so, how would I find out more info on how
> to do it?
> 
> Thanks for your help,
> Leighton
> 
> 

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