[Techtalk] sendmail configuration -> rejects for unknown user
rudy at edsons.demon.nl
Tue Nov 21 07:48:39 UTC 2006
Conor Daly wrote:
>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...
Late in the night i found the solution, using the virtuser table in
sendmail, example entries:
webmaster at another-site.com webmasters
sales at my-site.com sales at another-site.com
paul at my-site.com paul
finance at my-site.com paul
@my-site.com error:nouser User unknown
Its the last one that is important, taking care that unknowns are rejected.
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