> On Apr 1, 2021, at 12:02 PM, Michael Grimm <[email protected]> wrote:
>
>
> But it is good to know that smtp_address_preference might help me with other
> ISP blocking my IPv4.
For such cases I use the transport table:
master.cf:
smtp unix ... smtp
smtp4 unix ... smtp -o inet_protocols=ipv4
smtp6 unix ... smtp -o inet_protocols=ipv6
transport:
# IPv6 slow or rejected by exampl4.net
example4.net smtp4
# IPv4 slow or rejected by example6.net
example6.net smtp6
This does not require any changes in global defaults.
--
Viktor.
