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Re: greylisting on debian.org?

On Mon, Jul 10, 2006 at 05:57:45PM +0200, Adrian von Bidder wrote:
> On Monday 10 July 2006 02:17, Matthew R. Dempsky wrote:
> > On Sun, Jul 09, 2006 at 05:02:39PM -0700, Thomas Bushnell BSG wrote:
> > > Another problem is with hosts that do not accept a message from an MTA
> > > unless that MTA is willing to accept replies.  This is a common spam
> > > prevention measure.
> >
> > It also prevents mail from setups that use different servers for inbound
> > and outbound mail.
> Hmm.  I've not seen this kind of sender verification.  As I know it, the 
> receiving MX connects the regular MX for the sender address to see if 
> *that* is ready to receive mail.  Works beautifully if outbound != inbound.
> While very effective, this is admittedly the kind of spam prevention measure 
> which puts some load on the systems on both ends.

Actually, I don't see it as spam prevention. It is a mean to lock onself
out of broken|fascist mail servers and let their users know that it is their
server blocking legitimate email and not my users ignoring them. There is no
point in accepting a message that cannot be answered (or bounced). The
spam prevention is only a nice side effect.


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