Re: Greylisting

[Andy Jezierski]

Matt <[EMAIL PROTECTED]> wrote on 03/02/2005 07:19:42 AM:

> Hi,
> Is there any kind of plugin or patch for spamassassin that will allow
> me to selectively turn on GREYLISTing for certain user accounts?
>

Yep, like Steven said, greylisting has to kick in at the MTA level before SA even gets invoked.  So it depends on which MTA you are using. For Sendmail, Milter-Greylist is a good one, I'm using it. I'd safely say that greylisting has reduced our inbound spam by at least 90%. Of the remaining 10% that makes it in, SA filters out about 97%-98% of it.  
Be careful about the length of time that you auto-whitelist the senders, I believe that the table is stored in memory, someone chime in if I'm wrong, so if you're going to keep the entries for 60 days, you could potentially need a whole bunch of memory.

Also, if you're running sendmail 8.13 or above, look into the pre-greeting pause to eliminate some more spam before it even hits greylisting.

Andy