Reject non-existant users with exchange and exim

[Kosta Lekas]

There is a better way to pull a list of valid users from Exchange. There
is a Perl script out there that pulls all the smtp addresses form AD
using Net::LDAP. This is what I use to generate a relay_recipient list
on Postfix. I'm sure it can be tailored to generate an exim equivalent
file/ACL. The script queries an AD container and pulls all smtp
addresses. I keep my private distribution groups in a separate OU that
gets excluded from the LDAP search, this way I don't have to relay
private distribution groups that should only be originating internally.
The method Rob has referenced will also work but I find this one to be
more elegant.

Here is a link to directions on doing this with postfix:
http://www2.origogeneris.com:4000/relay_recipients.html
 
Here is a link to the script: 
http://www-personal.umich.edu/~malth/gaptuning/postfix/getadsmtp.pl


Kosta Lekas

-----Original Message-----
From: mailscanner-bounces at lists.mailscanner.info
[mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf Of Rob
Freeman
Sent: Thursday, April 20, 2006 7:08 PM
To: MailScanner discussion
Subject: Re: Reject non-existant users with exchange and exim

Check out here:

http://www.sng.ecs.soton.ac.uk/mailscanner/serve/cache/270.html

We use this with a few tweaks to only allow email to our valid exchange
users.

Rob

chardlist wrote:
> In the wiki documentation I see methods how to set up exim routers to
scan
> mail and then pass it along to another server (exchange in this case),
but I
> don't see a way to configure the exchange server and the ms server to
> communicate about valid addresses so that the mta on the mailscanner
server
> (exim) can reject the message before mailscanner has to deal with it.
Right
> now I am leaving the mailscanner server open to accept any mail to the
> domain with the exchange server and it's getting a bit out of hand.
>
> I realize this is more of an exim question, but I figure this is a
good
> place to start.
>
> MS 4.50.14
> Exim 4.52
> Redhat 9
>
>
> Thank you,
> -Brendan
>
>   

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