On Tue, Sep 26, 2023 at 10:35:39AM -0400, Wietse Venema via Postfix-users 
<postfix-users@postfix.org> wrote:

> > 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

Yes, I'm sure you're right, but I want to be able to receive
mail via ipv6, and if sending via ipv4 is ever impossible,
I'd rather attempt ipv6 and risk a rejection. I haven't gotten
any bounce messages since favouring ipv4 in the client, but
if I do I'll make this change for the client. Thanks.

cheers,
raf

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