raf via Postfix-users:
> On Tue, Sep 26, 2023 at 02:01:24PM -0400, Wietse Venema via Postfix-users
> <postfix-users@postfix.org> wrote:
>
> > Wietse Venema via Postfix-users:
> > > Wietse Venema via Postfix-users:
> > > > It's a rather long explanation for "why not do X". like several
> > > > times longer than the text that explains what protocol preferences
> > > > do. And this is the only place where adding that text would help.
> > >
> > > I updated the text a little:
> >
> > I'm adding a section to smtp_address_preferences, about when not
> > to use this setting.
> >
> > Wietse
> >
> > Notes for mail delivery between sites that have both IPv4 and IPv6
> > connectivity:
> >
> > * Some remote SMTP servers will flag messages received over IPv6
> > as more 'spammy' than messages received over IPv4. This may be
> > because the Postfix SMTP client's IPv6 address lacks a proper
> > PTR record, or because the client shares an IPv6 address block
> > with bad users.
> >
> > To achieve consistent delivery performance, don't tweak the
> > smtp_address_preference setting; instead, receive mail over
> > both IPv4 and IPv6, and deliver mail only over IPv4.
> >
> > /etc/postfix/main.cf:
> > inet_protocols = all
> >
> > /etc/postfix/master.cf
> > smtp ...other fields... smtp -o inet_protocols=ipv4
> >
> > * The setting "smtp_address_preference = ipv6" is unsafe. [Existing
> > text omitted for brevity]
>
> Should -o inet_protocols=ipv4 also be added to the relay directive?
The relay_transport is used for domains in main.cf:relay_domains.
Wietse
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