On 05.04.2013, at 14:34, Ashley Aitken <[email protected]> wrote:

> 
> My question is: do people still use graylisting?  


I use greylisting on my servers though these are not Mac based and not using 
the same greylisting implementation.  Been running it for years this way.   
This is for a small email hosting service.

I use an implementation tied into spamassassin and exim that only greylists 
things that are suspected of being spam.  Other stuff comes right in.   I 
believe it also does not tie the greylist to the sending server, but rather 
according to sender name and message ID so that it does not matter if the 
sender switches servers.  Which avoids the problems listed by Markus.

I've had no known issues with my greylisting the way my system does it.  The 
only issues have been mail suspected as being spam, ie, in spamassassin.  But 
not with the greylisting aspects.   I whitelist known senders like banks 
(specific from addresses) and things that are known to cause issues on our 
systems.

Problems with greylisting are probably implementation specific.   If you have 
issues with the implementation, see if you can tweek some parameters.

btw, my greylisting service requires a min wait of 10 minutes.  Don't remember 
any issues with it.  If there have been, it was a long while ago.

Chad

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