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Re: greylisting on debian.org?

On Mon, Jul 10, 2006 at 06:28:40PM +0100, Stephen Gran wrote:
> This one time, at band camp, Henrique de Moraes Holschuh said:
>> On Mon, 10 Jul 2006, Adrian von Bidder wrote:

>>> 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.

>> And sets the envolope sender to what in the probe?

> <>, hopefully.  Anything else is silly.

Yes and no. An increasing number of sites refuse "bounces" (that is
messages with null return-path) to some addresses that are known never
to send mail. This breaks the procedure and is reacted by other sites
by using a fixed "just-probing-here@their_domain" address, and mail to
that address doesn't incur that check (but ends up in /dev/null or
gets refused at DATA time).


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