[OT] - Configure sendmail to drop incoming unknown user emails

[Landon Stewart]

I would google for creating a catch-all address and set the
destination of the catch-all to an alias defined in /etc/aliases
pointing to /dev/null.

You'll probably need to use virtuser table to do this.

On Thursday, May 20, 2010, Miguel Koren O'Brien de Lacy
<miguelk at konsultex.com.br> wrote:
> Ken;
>
> Thanks for the idea. I'm not trying to do anything spam or virus
> related. This is an internal smtp server just for internal email alerts
> to internal users. I need to avoid the error message when it gets email
> for an unknown user. I suppose I have to do some testing.
>
> Ken A wrote:
>> In /etc/mail/access
>>
>> To:validuser at somedomain.com             RELAY
>> To:validuser2 at somedomain.com            RELAY
>> To:somedomain.com                       DISCARD
>>
>> System users may not need to be listed, but if you are pulling them
>> from ldap.. then maybe. I've used this on relays, not mail hub.
>>
>> Why would you want to create such a spam magnet anyway?
>>
>> Ken
>>
>>
>> On 5/20/2010 2:28 PM, Miguel Koren O'Brien de Lacy wrote:
>>> Hi Eduardo,
>>>
>>> Thanks for the answer. For now I would be happy just to silently
>>> discard mails
>>> to users that are not linux users on the same server. But my real
>>> problem
>>> further down the road is in ldap (active directory). So users not in
>>> AD are
>>> considered invalid emails. I decided to approach this in steps ;-)
>>>
>>> Miguel
>>>
>>> Eduardo Casarero wrote:
>>>>
>>>>
>>>>  2010/5/20 Scott Silva<ssilva at sgvwater.com<mailto:ssilva at sgvwater.com>>
>>>>
>>>>      on 5-19-2010 5:57 PM Miguel Koren O'Brien de Lacy spake the
>>>> following:
>>>>      >  Ladies and Gentlemen;
>>>>      >
>>>>      >  I need to configure sendmail to silently drop emails
>>>> received for
>>>>      >  unknown users on the server. In other words I don't want the
>>>> sender to
>>>>      >  thinks that the email was received and then I want to put it in
>>>>      >  /dev/null. This is not for special needs for an internal
>>>> application and
>>>>      >  not for any real interset email server. I searched around
>>>> about how to
>>>>      >  do this and found some links that seem to imply that it's
>>>> possible but
>>>>      >  no real solution. Can anyone point me to the right place for
>>>> this?
>>>>      >
>>>>      >  Thanks.
>>>>      >
>>>>      >  Miguel
>>>>      >
>>>>      Sendmail should be doing this already... You have changed
>>>> something to make it
>>>>      NOT reject unknown users.
>>>>
>>>>
>>>>  Sendmail can "discard" the email, in fact in access.db you can
>>>> setup for
>>>>  example "From: 1.2.3.4 DISCARD" so every email from that ip is
>>>> silently
>>>>  discarded. How do you now if an user is either valid or not? Ldap?
>>>>
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