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
            

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