[NBLUG/talk] Stopping spam with postgrey (greylisting)

[Troy Arnold]

On Tue, Jul 11, 2006 at 02:26:11PM -0700, E Frank Ball wrote:
> 
> There was an article posted on the web a couple weeks ago
> about using postgrey to implement greylisting with postfix:
> 
> http://www.howtoforge.com/greylisting_postfix_postgrey
> 
> Greylisting rejects mail with a 450 error (temporary error,
> try again later) with the assumption that most spammers won't.
> 
> I tried it out, it was really easy to install and configure,
> and it works great.  80% spam reduction.  No real mail lost.
> 
> If you run you own mailserver and use postfix you should
> check it out.  They hope to have exim support soon.

I've been running this for a few months now.  It's been great.  No one has
complained yet about lost mail yet...  Occasionally the delay can be a
annoying, but I'm still using the default of 300 seconds.

On a related note, check this out:
http://www.howtoforge.com/mail_statistics_mailgraph_pflogsumm

I haven't implemented it yet.

-troy