Bounce Rules

Dave Dave
Thu Oct 27 01:08:22 IST 2005


On Wed, Oct 26, 2005 at 07:08:48PM -0400, Matt Kettler wrote:
> Dave Shariff Yadallee - System Administrator a.k.a. The Root of the Problem wrote:
> > I did order the book and I do recommend it.
> > 
> > Question, for bounce rules, ho do I bounce spam > a score of 7.5 ?
> > 
> 
> Don't..
> 
> Rejecting spam at SMTP delivery time is fine, but don't _ever_ bounce it. I for
> one treat it as intentional malicious misconfiguration and will *immediately*
> blacklist a network that bounces a joe-jobbed spam to me.
> 
> Unfortunately, all of mailscanner is done post-delivery, so you can't do SMTP
> time rejects using it.
> 
> Of course, the post-delivery scanning part of Mailscanner's design is what makes
> it deal with bursty loads so well.
> 
> Sadly, you can't have it both ways. Delivery time scanners can reject, but the
> fact that they scan at delivery time severely limits your peak delivery rate.
> SpamAssassin instances are large, and you'll wind up memory limited in terms of
> the number of simultaneous scanners you can have running. Eventually this will
> lead to dropped connections which will have to retry delivery later.
> 
> Admittedly the average delivery rate is the same, but queue-first-then scan
> methods like MailScanner can deal with a short term burst at the expense of
> increasing the mail queue depth.
>

delete works better.
 
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This message has been scanned for viruses and
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believed to be clean.

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