[nzlug] (OT) Sorbs etc, was Exim: Limiting outgoing connections on Debian

[Cliff Pratt]

Robin Sheat wrote:
> On Wednesday 11 October 2006 09:02, Cliff Pratt wrote:
> 
>> Ha! If the greylist is set up right, then maybe it will go straight
>>  through. In my experience most greylists are set up wrongly,
>> either inadvertently or on purpose, to reject every single email on
>> the first try. Every single email.
> 
> Well, a while back I played with greylisting, and the default setup
> for (IIRC) postgrey was to reject each [from, to, server] tuple the
> first time it was seen, and after that, only reject it again if that
> tuple hadn't been seen for a month. That way, people see very few
> rejections. As I understand it, that's how it should be set up.
> 
The usual way that greylisting is set up is to send a temporary failure
to the sender's server first time, *and* require a retry within 5, 10,
or 15 minutes before accepting emails. Some send temporary failures
twice before accepting emails. In my experience the timeout is much
shorter than a month, and is often one day.

Cheers,

Cliff