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Milter-greylist

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Re: Handling mail farms (was Re: [milter-greylist] planned features, call for volunteers)

2006-12-24 by Joel Reicher

> Joel Reicher <joel@...> wrote:
> 
> > > racl whitelist spf
> > 
> > I'm not sure if this has already been dealt with, but the mechanisms
> > in 3.0 for dealing with mail farms by whitelisting them, be it based
> > on IP or SPF, seems a misfeature to me. There's no guarantee that just
> > because mail comes from a farm that it is not spam, and in fact
> > there's a good chance that an SPF-compliant source is not well-behaved...
> 
> The point about having SPF as an ACL clause is that you can use it with
> other clauses. You could decide to trust SPF for mail coming from a set
> of IP netblocks, for instance.

How would that be different from the current situation? I want to use SPF
to deal with mail farms so that I don't have to enter them all by hand, but
I don't want just to whitelist SPF-compliant senders because some of them
are spammers.

In other words I still want to greylist SPF-compliant senders, but use
the SPF record to deal automatically with potential mail farms.

As far as I can tell, using the SPF record as if it were a "subnetmatch"
for just those IPs is the only correct solution.

Thanks,

	- Joel

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