Re: Giving Greylisting A Try

> > Interesting to watch all the other connection attempts coming through.
> > Are all these random machines open proxies rather than open relays?
>
> Seems like there are some open relays. But the usual overnight flood of
> spam has dwindled to a trickle (so far).
>
> You do have to be careful, though. Checking through my logs, I
> discovered that GitHub is attempting to send me a message.
> Unfortunately, each time they retry, the connection comes from a
> different server in their network. So the greylister doesn’t match it
> up with any previous attempt, and rejects it anew.
>
> This is a known issue with greylisting, when dealing with certain
> large organizations running lots of mail servers, and sqlgrey already
> includes some standard lists of domains to work around this in its
> whitelist. I have added *.github.com to my list.

Lawrence, would you mind talking about greylisting at the September
WLUG meeting? Maybe a quick walk through how to set it up and what
pitfalls to be aware of?

Cheers, Peter
-- 
Peter Reutemann
Dept. of Computer Science
University of Waikato, NZ
+64 (7) 858-5174
http://www.cms.waikato.ac.nz/~fracpete/
http://www.data-mining.co.nz/
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