Re: Giving Greylisting A Try

I wrote:

> 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.
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