[Techtalk] sendmail configuration -> rejects for unknown user

[Conor Daly]

On Mon, Nov 20, 2006 at 02:55:17PM +0100 or thereabouts, Rudy Zijlstra wrote:
> 
> What i would like to do, is teach sendmail to check whether the local 
> recipient exists, and refuse if not. I know it is possible, but after 
> several hours of searching i still have not been able to find how to do 
> it. Can anybody give me some pointers  on this one?

It can probably be done with sendmail but, what I did was install exim and
use the eximconfig package at http://www.jcdigita.com/eximconfig .  This
does lots of SMTP filtering for stuff like unknown users, misconfigured
connecting servers (most spam bots do only the sending bit, not receiving)
and more .  It also does grey-listing where a message is temporarily
rejected and accepted if it is resent within a certain time window.

It's almost set and forget though I did have to do some tweaking after it
rejected some valid senders...

Conor
-- 
Conor Daly,                   
Met Eireann, Glasnevin Hill,  
Dublin 9, Ireland             
Ph +3531 8064276 Fax +3531 8064247

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