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Re: greylisting on debian.org?

This one time, at band camp, Lionel Elie Mamane said:
> 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).

When I find sites that are broken, I report them to dsn.rfc-ignorant.com,
and then others can use that as a whitelist or blacklist as they choose
for deciding what to do with callouts and the like.  I do refuse the
null sender to various role accounts that never send mail, but I don't
do it at RCPT TO time, only after the remote end has sent DATA.  This
allows callouts to work, but still blocks bounces resulting from joe
jobs and the like.

Take care,
|   ,''`.                                            Stephen Gran |
|  : :' :                                        sgran@debian.org |
|  `. `'                        Debian user, admin, and developer |
|    `-                                     http://www.debian.org |

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