Fake Reply and sender address - looping receive mail inmailscanner

[mcornes]

First post.
Well I'll explain how we do the reject at SMTP rcpt.

Every hour a cron job searches our active directory tree for any valid  
e mail addresses. These are then added to a database held by our mta  
(post fix) and from then on an e mail for an address we don't select  
is binned by the mail scanner box it isn't even scanned.

This has the benefit of lessening load on what mail scanner actually  
has scan (and indeed virus check) but has the slight draw back of any  
new staff mail takes one hour before it is useable externally. That  
can be altered so the scan is performed more regularly I suppose.

Hope this helps - I can post more exact instructions to what I did or  
links to the tutorials if that helps ?

Mark

Sent from my iPhone!

On 15 Jul 2008, at 09:55, "Hostmaster" <Hostmaster at computerservicecentre.com 
 > wrote:

>> 3.  How can i trap  bogus reply address or stop mailscanner sending  
>> this
>> emails on second attempt ( looping)
>
> The problem is twofold. The first part is the other mail servers -  
> they should
> not be accepting mail which they cannot deliver to a user, but this  
> is nothing
> you can fix. The second part is yours - you should not be accepting  
> mail to
> users which do not exist. You should configure your MTA to reject  
> (at SMTP RCPT
> time) messages which you cannot deliver to a user, which will  
> prevent your
> server from bouncing these messages back. How to implement this  
> depends on the
> MTA you are using, and I'm sure someone here can give you pointers  
> for any MTA,
> or you can search the archives as this has been discussed numerous  
> times.
>
>
> --
> Best Regards,
> Richard Garner (A+, N+, AMBCS, MOS-O)
> Hostmaster
> Computer Service Centre
> web     http://www.computerservicecentre.com
>
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