On 10/15/20 2:02 PM, jeremy ardley wrote:
how/where do I configure (just) the dovecot smtp-client -> submission_relay_host to only connect IPv4?
It appears your host has A and AAAA records in your DNS. The clients will try IPV6 first if they see an AAAA record.
If you don't need IPV6 for your host remove the AAAA record. All connections will then only use IPV4.
If you need IPV6 for some other reason then create an alias DNS A record and point your clients to that instead
That's not the issue.
All my machines are dual stack. All my hosts' DNS records exist for both A & AAAA records.
Some services listen on only IPv4, some only on IPv6, some both.
For Dovecot _listeners_ it's trivial to set IPv4/6-only, or both, addresses.
It's also trivial to set OTHER clients, connecting TO Dovecot, to use IPv4-only.
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.