Today I got this bounce from somebody whose mail had been rejected: <catalog-...@python.org>: Protocol error: host mail.python.org[82.94.164.166] refused to talk to me: 220-mail.python.org ESMTP Postfix 521 5.7.1 Blocked by DNSBL
It was quite hard finding this in my log, since the bounce from the french system only contained hostnames which would not resolve :( May I recommend that Postfix at least emits the IP in it's rejection message, e.g. like: 521 5.7.1 123.123.123.123 Blocked by DNSBL -- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebra...@charite.de | http://www.charite.de