Luigi Rosa:
> Is there a way to override smtp_address_preference for a single host (or
> domain) to force an IPv4 or IPv6 connection?

/etc/postfix/transport:
    example.com smtp-ipv4-only:
    example.net smtp-upv6-only:

/etc/postfix/master.cf:
    smtp-ipv4-only      unix  -       -       n       -       -       smtp
        inet_protocols=ipv4
    smtp-ipv6-only      unix  -       -       n       -       -       smtp
        inet_protocols=ipv6

/etc/postfix/main.cf:
    transport_maps = hash:/etc/postfix/transport

Execute "postmap hash:/etc/postfix/transport" and "postfix reload"
when the transport map is changed.

http://www.postfix.org/postconf.5.html#inet_protocols

        Wietse

> I am asking because we are (hopefully even if slowly) approaching to a period
> when IPv6 could be adopted not only by SMTP servers with (presumed) skilled
> SysAdmin, but also by large organization whith sloppy IPv6 support.
> 
> A sort of tranport map for IPv4/IPv6/any could be useful for:
> * force IPv4 connection with bogous IPv4/IPv6 MTAs
> * force IPv6 connection for testing purposes
> 
> 
> 
> Ciao,
> luigi
> 
> --
> /
> +--[Luigi Rosa]--
> \
> 
> Got Mole problems? Call Avogadro 6.02 x 10^23
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