[pfx] Re: Per recipient sender access via an access policy delegation server

John Fawcett:
> I'm posting this message in case anyone would find it useful to have an
> access policy delegation server that implements per recipient sender access.
>
> I have been using check_sender_access as a deny list for senders that I
> want to block from sending me email, usually emails that started off as
> legitimate but after unsubscribing still keep coming. The issue is that
> when I block a sender, I do so for any recipients that use the server,
> not just me. While in practice that hasn't caused many issues, it always
> worries me that I might block email other users want to receive.

Wietse:
> Would a postfwd policy ruleset handle that?
>
> Unlike access maps that give an answer based on a single property,
> policy lookups support multi-criteria decisions by design.

John Fawcett:
> Yes, I think you're right that existing policy delegation servers can 
> also handle this. Nevertheless I tried a different design with a single 
> process managing multiple connections via python selectors which use 
> various underlying methods such as epoll on Linux rather than a forking 
> or preforking model. Not sure how that will compare for performance or 
> reliability or whether I will even notice the difference on my low volumes.

It should work either way, regardless of forking versus not forking.

	Wietse
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