Milter-greylist

Hi Petar,

> On Fri, Jan 16, 2009 at 10:15:25AM +1100, Michael Mansour wrote:
> > Hi,
> > 
> > > Am Donnerstag Januar 15 2009 01:49 schrieb Michael Mansour:
> > > > Hi Dan,
> > > >
> > > > > > Hi,
> > > > > >
> > > > > > I use uribl to score emails in SA. What I'd like to do is just drop
> > > > > > any emails that exist in URIBL_BLACK (the blacklist category of
> > > > > > uribl).
> > > > > >
> > > > > > I'm looking for a way to do this and am wondering if milter-greylist
> > > > > > can
> > > >
> > > > do it?
> > > >
> > > > > > I don't think it can because a message needs to be accepted first,
> > > > > > scanned to query the URI in it against multi.dnsbl.com and then
> > > > > > perform an appropriate action.
> > > > >
> > > > > You used the word drop.  Drop is easy.  REJECT is hard.
> > > >
> > > > Hmm.. ok, how would I just drop these emails?
> > > >
> > > > I'm currently looking in SpamAssassin but it's basically a message filter
> > > > and scorer, no drops. Checking SA 3rd party plugins also don't show any
> > > > which drop.
> > > 
> > > perhaps you would like to check out MIMEdefang? (www.mimedefang.org)
> > 
> > Yeah I know about that but the thing I'm trying to avoid is accepting the
> > emails for processing altogether. When my servers get hammered with 10 or 20
> > spams a second, processing that trash only to delete it wastes valuable
> > resources. It's much better to handle it at the MTA and reject there, so as
> > not to even process the trash.
> 
> As long as you're doing checks against the message body, you are
> processing the message. Just because the processing may take place
> during the SMTP conversation, doesn't mean that it will claim less
> resources.

Hmm.. yes you're right. It only comes down then to the processing at the MTA
being less than the processing done at the scanner. I use MailScanner which
logs into a DB, so in my case doing this part at the MTA saves processing and
mail logging down the road, but that may not be the case for others.

Thanks and regards,

Michael.

>    Petar Bogdanovic