ref

https://dovecot.org/pipermail/dovecot/2020-October/120226.html

On 10/15/20 10:13 PM, Aki Tuomi wrote:

...

I'm asking how/where to 'tell', via config, Dovecot's smtp-CLIENT, that's making to connection to the submission_relay_host, to use _only_ IPv4.

There is currently no (other) way to do this than using /etc/hosts or specifying IPv4 address for the relay host.

Is there a bug request opened for this, then ? Is it planned for implementation ?