Configuring sendmail to drop invalid users

[Rob]

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I have a question I am confused about, how do most people here use sendmail?
I mean I simply use sendmail as is out of box, so to speak with a couple
additions like Mailscanner and such. But I do not have, let me see if the
term is right, "virtual domains and users"??

I host about 50 or so domains on my sendmail box , running on redhat 9.0

They way it works now is, if you send mail to rob at domain.com, the user rob
on the system will get it. so if you sent it to rob at domain.com or
domain2.com or any other domain I accept mail for , rob will get it.

Now is this what most people do? As I get some clients asking me to stop
email going to joe at domain.com as he is joe at domain2.com but he gets the email
going to joe at domain.com

if I need to have 2 robs at a domain.com I simply create system user rob2
and forward rob at domain.com to rob2 in my virtualusertable file, and leave
the original rob there, where any other rob at domain2.com will go.

have I confused everyone now??

But I would like to simply have a set up where I can have multiple robs on
multiple domains without doing this and if email is sent to rob at domain.com
and there is no rob at domain.com but there is at domain2.com I want the email
rejected for rob at domain.com

sorry if this should not be discussed on this list....

But any info would be appreciated...

:)

Rob....



----- Original Message -----
From: "Mailing List Subscriber" <lists at ListOwners.Net>
To: <MAILSCANNER at JISCMAIL.AC.UK>
Sent: Tuesday, September 28, 2004 4:34 PM
Subject: Re: Configuring sendmail to drop invalid users


> kfliong <kfliong at WOFS.COM> said:
>
>
>> I now want to refine script by allowing only mails sent to valid users.
>> Those mails send to invalid users currently goes to catchall account. And
>> I
>> have configured catchall to go to /dev/null. But this is not good enough
>> as
>> these mails are still keep in queues and then processed by mailscanner.
>> Is
>> there a way to drop these mails directly from MTA level?
>
> So you have your regular aliases defined for addresses that you want to be
> deliverable, then a catchall that sends anything else to /dev/null, but
> you
> actually want anything else to be rejected.  Pretty simple.  Just get rid
> of
> the catchall.  End of problem.  If the invalid address does not match a
> defined alias, and no catchall exists, (which is how it becomes invalid),
> sendmail will automagically reject any mail sent to that address as "user
> unknown" during the initial communications between hosts.  You won't wind
> up
> queueing any mail at all this way.
>
> Because you have a catchall defined, all addresses, real and imagined, are
> valid and therefore deliverable.  Remove the catchall and the only
> deliverable addresses are those you have aliases for.  The rest get
> rejected
> automatically.  I don't see a need for any special scripts here.
>
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