Mailcow-dockerized: Relaying local mails trough exim4 to Mailcow dockerized

[Johnnii360]

Is your feature request related to a problem? Please describe.
Yes. Want to relay mails from/trough local MTA exim4 to Mailcow dockerized.

Describe the solution you'd like
Is there any tutorial of this? I only found a tutorial for postfix in the documentation.

And I already googled but didn't found anything useful.

[andryyy]

If someone is able to help, we will add it to the docs.

[marrco]

on a Debian server:

# /etc/exim4/update-exim4.conf.conf
dc_eximconfig_configtype='smarthost'
dc_smarthost='12.34.56.78'

and

# /etc/exim4/exim4.conf.localmacros
MAIN_RELAY_TO_DOMAINS = lsearch;/etc/exim4/relay_domains

with

#/etc/exim4/relay_domains
locadomainone.com
localdomaintwo.org

/etc/exim4/hubbed_hosts

locadomainone.com: my.mailcowone,com::2525:my.mailcowtwo,com::2525
localdomaintwo.org: my.mailcowone,com::25

hubbed hosts are referenced inside /etc/exim4.conf.template
# router/150_exim4-config_hubbed_hosts

inside mailcow, you have to define Forwarding Hosts in Configuration & Details.

hth

[MarkOnDuty]

I'm trying to do the same thing, but with Postfix on the satellite system. My goal is just to be able to send from the command-line, or from daemons, via mail .

At the moment, I'm getting Client host rejected: Access denied in the satellite system's mail.log.

I was able to get this working on a MIAB system a couple of days ago, for whatever that is worth.

I'd switch to Exim in a heartbeat if it were simpler than Postfix.

[MarkOnDuty]

Exim4 is the cat's pajamas.

Following this guide for Ubuntu 16.04 worked perfectly. I only had to complete up to and including step 5.

[Johnnii360]

Thank you, @marrco ! It's working like a charm. :)