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]
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