Fernando Gozalo:
> Hi,
>
> >>>> does the postfix smtp client implement the IPv6 to IPv4 fallback
> >>>> mechanism as browsers do?
> >>>
> >>> Postfix implements the MX fallback strategy as defined in the SMTP
> >>> RFC (5321). In addition, Postfix implements this:
> >>>
> >>> smtp_address_preference (default: any)
> >>> The address type ("ipv6", "ipv4" or "any") that the Postfix SMTP
> >>> client
> >>> will try first, when a destination has IPv6 and IPv4 addresses
> >>> with
> >>> equal MX preference. This feature has no effect unless the
> >>> inet_proto-
> >>> cols setting enables both IPv4 and IPv6. With Postfix 2.8 the
> >>> default
> >>> is "ipv6".
> >>>
> >>> This feature is available in Postfix 2.8 and later.
> >>>
> >>> Wietse
> >>
> >> It works with 1 mx with A and AAAA records.
> >>
> >> It didn't work with 2 mx with both A and AAAA records
> >> (https://bugzilla.redhat.com/show_bug.cgi?id=813863).
> >
> > What is your smtp_address_preference setting?
>
> $ postconf smtp_address_preference
> smtp_address_preference = ipv6
RTFM (see above) or upgrade.
> $ postconf inet_protocols
> inet_protocols = all
%@%&@%^#$& idiot Linux distributors.
Wietse
