MS gateway checking for valid users before delivery

[Drew Marshall]

On 29 Dec 2005, at 05:21, Glenn Steen wrote:

> On 29/12/05, Pete Russell <pete at enitech.com.au> wrote:
>> If you want a perl script that will
>> 1. query AD for ALL valid usernames
>> 2. Build the map file in the correct postfix format
>> 3. Postmap it and reload postfix
>> All you need to do is cron it and you have implemnted milter ahead  
>> for
>> postfix and exchange, let me know and i will email it to you.
>>
>> We have been using this for years and it works flawlessly and can be
>> implmented in realtime without causing downtime.
>>
>> Maybe its in the wiki too?
>>
>
> Yes.... Didn't you write that Pete? Anyway, here's a link:
> http://wiki.mailscanner.info/doku.php? 
> id=documentation:configuration:mta:postfix:how_to:reject_non_existent_ 
> users#rejecting_unknown_non-local_users

Pete wrote the original for Notes/ Dominio in the old MAQ and I  
converted it to the wiki (And added a couple of bits for Exchange).  
Anyway to the OP the wiki covers how I would do it.

However, if you want to implement a milter ahead style feature,  
Postfix comes with this built in have a look at  
reject_unverified_recipient under smtpd_recipient_restrictions. You  
can read more here http://www.postfix.org/postconf. 
5.html#smtpd_recipient_restrictions be aware though you must have  
implemented smtp filtering on the Exchange server for this to work  
(So unknown recipients are rejected at smtp stage and not bounced  
later) or else non of these types of checks will work (No matter  
which MTA you use).

Drew

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