[wellylug] Greylisting .. does it work?
Daniel Pittman
daniel at rimspace.net
Mon Dec 29 12:25:44 NZDT 2008
Ian Beardslee <ian at karearea.gen.nz> writes:
> Actually this is a test to see if the greylisting is working or just
> screwing with my email.
It should be working, although it helps to use a tool like postgrey that
(a) comes with a pre-build whitelist for broken services, and (b) is
liberal about "from the same IP", by defining it as a larger chunk of
space.
> I've added greylistd to my exim config and the amount of junk coming
> into my systems has gone down massively. But so has the rest of my
> email - I have had some email come in (a test from my gmail account).
If you have a lot of correspondence with either Optus or Telstra email
users then it could be causing you grief: they have appallingly bad
retry times, and pass the mail to a second set of servers after the
first connection.
This leads somewhere between 24 and 48 hours of delay if greylisting[1]
is in play.
Regards,
Daniel
Footnotes:
[1] ...or a genuine overload or fault causes a 4xx error.
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