On Nov 21, 2016, at 3:30 PM, MRob <mro...@insiberia.net> wrote: > Appreciate the reply, but I wasn't asking how to set it up. I thought my > question made it clear I was asking about the pros/cons of the placement of > SA in the mail flow.
No, that wasn’t clear. At least not to me. The main advantage to checking spam status early is to reject the mail outright and possibly black list the sending IP address. the disadvantage, of course, is you have to hold the connection long enough to score the email. The main advantage to scoring after delivery is that you can foist the work off to an LDA the can, honestly, take as long as it wants to process and score the mail. Also, this might be an entirely different machine than the one receiving mail. The disadvantage is you receive a lot more spam. > Please see my message just sent a minute ago for another try. > > By the way it is my impression that, at least for sites with volume above > that of a home or very small business, calling out to filters like SA or clam > during the SMTP transaction can really kill performance and that it's best to > simply send messages scored very highly to the bit bucket. Not sure where the cutoff is, but many reasonably large mail servers use amavis (or similar) to score mail and will reject it for high spam levels. Not the gmails of the world, but still, large servers.
