* brian <postfix-l...@logi.ca>:

> organisation). The old domain points to this new server in order to
> redirect web traffic. AFAIK, there were never any email addresses
> used under the old domain. But, now I've set up postfix, I'm seeing
> thousands of failed attempts to send to various fictitious DOMAIN.com
> addresses. These are properly being blocked 554/relay access denied.

Which domain is the old one, which is the new one?

> myhostname = demeter.DOMAIN.org
> mydomain = DOMAIN.org
> myorigin = $mydomain
> alias_maps = hash:/etc/aliases
> alias_database = hash:/etc/aliases
> mydestination = $myhostname, $mydomain, localhost.$mydomain, localhost
> relayhost =
> mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
> smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination

Shouldn'T you use at least ONE RBL?
E.g.:

smtpd_recipient_restrictions =
  permit_mynetworks,
  reject_unauth_destination
  reject_rbl_client zen.spamhaus.org
  

-- 
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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