Hi Dovecot Gurus,
I have been playing around with the submission service. I have managed
to get all the things working that I want working with two exceptions.
I have not found (or possibly I have overlooked) solutions in the
documentation or discussions on the 'net.
First; I would like to be able to authenticate against my backend MTA
using the user-supplied credentials. I have tried setting
submission_relay_user as %u and submission_relay_password as %w, but
these seem to be passed through as literal strings, and of course my
backend MTA has no idea who %u is.
I found a post from 2019 that indicates passing the
submission_relay_user/password to the backend is not a supported
function, but hoping that maybe that is outdated info.
I also found:
https://doc.dovecot.org/3.0/configuration_manual/authentication/proxies/
Which seems to indicate it could pass credentials to a non-Dovecot MTA
backend, but I am not really clear from the docs on how to set that up,
and I did not find any relevant examples to work from. Seems like it
would be setting up a Director service, maybe? I have done that before
and I do manage multiple email servers, but none of them is clustered or
configured to be interoperable, so not sure if this is a viable approach.
Second; I am wondering about the possibility of having multiple
submission_relay_host entries. For example if I have dovecot submission
services running on my standard port 587 and 465 connect to a relay on
the same box through localhost, but could I have another submission
service running on another port, say 5587, and relay all traffic
received on that port through a completely different host?
I am thinking I could set that up by running a separate instance of
dovecot for just that service, but maybe there is a more suitable way?
I don't have a solid use-case for this in mind at the moment, but given
that I do manage multiple email servers, I am thinking that if this is
possible it might provide some useful corner-case configurations down
the road.
Thank you for reading my post, any thoughts, information, or pointers to
relevant documentation would be most appreciated.
--
Bob Miller
867-334-7117
www.computerisms.ca
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