Milter-greylist

Adam Katz a \ufffdcrit :
> Another potential feature would be to utilize SPF (though not blindly as
> the milter-greylist option does) in the following manner:  if
> smtp.sender.com is listed in SPF, add all servers listed by SPF in the
> autowhitelisting.  This would solve the issue created by redundant smtp
> servers (whose extreme case is exhibited by gmail as noted earlier).

It's a great idea.
That's exactly what I manually do from time to time, when I discover an 
ISP has changed his config and his new servers are not yet listed in 
dnswl: see if it has an SPF record, and if so take the IP listed and put 
it in my local whitelist.
Of course the better way would be that such ISPs implement SRS, so their 
SPF would always validate, even when forwarding...
And of course it's preferable to whitelist only "trusted" SPFs, ie not 
those who include "+all" and the like: this is what the "spf self" 
clause is meant for.

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