OSEC

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Re: New principles of antispam

From: Angelos Karageorgiou (angelosunix.gr)
Date: Mon Jul 16 2007 - 08:36:45 CDT

Absolutely!
I use seperate MXs and SMTP servers , I do block outgoing spam but at far less stringent level than my Incoming email. Also the amount of mail allowed through per time unit  is slightly different,
and of course I do have a bulk mail server for all those notorious ab-users.

By having different MX and SMTP ( submission ) servers you can differentiate your "QOS" per
service !!!



O/H Noel Jones Ýãñáøå: 
On Mon, Jul 16, 2007 at 01:34:44AM +0200, ml wrote:
  
Secondly, I wonder if I'm right when I say that an outbound SMTP must 
also be a MX for the sender domain that come from. Of course I know they 
are not, in an absolute way, correlated.
But, in real life, how are they corerlated ?
    

Often not at all.  This is another common assumption that is wrong.
Many many legit originizations use different services for MX and 
for sending mail, and there is good reason why this is never 
checked.  

I suppose one could use this as a basis to bypass
greylisting if the sender is listed as an MX.  One might assume
that an MX is a real MTA so there is no point in greylisting.

But to assume any further significance would be a big mistake.