[Techtalk] sendmail configuration -> rejects for unknown user

[Mike]

> 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...
>>
>>Conor
>>
>>
> Late in the night i found the solution, using the virtuser table in
> sendmail, example entries:
>
> webmaster at another-site.com   webmasters
> @another-site.com            marc
> 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.
>
> Rudy
>


If you go that route, remember after you edit to type:

make
/etc/init.d/sendmail restart







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