pf at alt-ctrl-del.org put forth on 8/27/2010 1:23 PM: > Is there any known policy server or add-on, that will change the > tempfail action after a couple of hours, for things like > reject_unknown_client_hostname and reject_unknown_client_hostname? > > Sending a reject has problems. I don't want to flat out reject, based on > a temp error. > Sending a 450 has problems. Some sender clients may try to resend the > email, once per minute for two or three days before giving up. > > So while that message is in limbo on the sending server: The end user > who sent it assumes that there is something wrong on our end. The > recipient who expects it assumes that there is something wrong on our > end. And the admin on the sender side does not find out that the problem > is on their end, until several days later. > > I guess it would be an adaptation of greylisting, where. > default unknown client/hostname = DEFER_IF_PERMIT > > greyhostclient policy > firstseen timestamp for unknown client/hostname > greyhostclient_delay = 4h > return DEFER_IF_PERMIT during the 4h window. > Then after 4 hours, REJECT is returned instead. > > Anything like that out there?
You're barking up the wrong tree. Assuming you have Postfix 2.3 or later, use reject_unknown_reverse_client_hostname _instead of _ reject_unknown_client_hostname Read the definition of each at: http://www.postfix.org/postconf.5.html#smtpd_client_restrictions reject_unknown_client_hostname is far too restrictive in most cases, and will cause all kinds of temp fails. It will, for instance, temp fail every connection from Hotmail (unless MS fixed their DNS recently). -- Stan
