dovecot Error: Failed to establish relay connection: Failed to connect to remote server

[Alexander Dalloz]

Am 27.11.2021 um 07:34 schrieb fugee ohu:
> submission_relay_host = 127.0.0.1
> submission_relay_ssl = starttls
> submission_relay_trusted = yes

Make sure your MTA listens on localhost port 25 offering STARTTLS.

See https://doc.dovecot.org/admin_manual/submission_server/

Alexander