Alice Wonder:
> Static IP, Linode. Only the IPv6 was listed, the IPv4 was not, but it
> seems that postfix usually chooses IPv6 when the receiving MX resolves
> on IPv6. And that's probably the correct behavior.
smtp_address_preference (default: any)
...
Postfix SMTP client address preference has evolved. With Postfix 2.8
the default is "ipv6"; earlier implementations are hard-coded to prefer
IPv6 over IPv4.
The reason to use "any" is so that mail won't get stuck, as long as
at least one IP protocol (Postfix mission is to deliver mail, not
to enforce preferences for a specific protocol).
Wietse
