> Sadly, I need smtp_address_preference = ipv4 because some > reputation systems (spamhaus, I think) don't realise > that an entity might only have a single ipv6 address.
Then you should disable IPv6, in the PostfiX SMTP client
(master.cf: smtp -o inet_protocols=ipv4) or globally
(main.cf:inet_protocols=ipv4).
Wietse
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