Currently for some reason postfix decided to drop all email that are
supposed to be relayed by default. This is obviously unwanted behaviour.
This patch takes the settings from the workaround.org project, applies
them to submission and submissions, which fixes the current issue.

However I still don't fully understand why.

References:
https://workaround.org/ispmail/bullseye/relay-outoing-email-through-postfix/

This patch disables error queries from zenhaus. It requires some more
tinkering down the line, but should accept email for now.

This patch adjusts the postscreen settings regarding dnsbls and alike to
hopefully speed up the processing time of emails and make the place more
inviting for wanted e-mails.

DNSWL went subscriber-only apparently.

References:
https://www.dnswl.org/

Currently postfix reports and error due to the missing service. This
patch fixes the problem by enabling the expected service in master.cf

This patch should enable the postfix setup in MoK to utilise the
proxy-protocol and therefore gather required IP information from
connecting clients.

It's implemented based on some documentation regard the topic and is
useful for reverse-proxy setups e.g. behind haproxy.

References:
https://www.haproxy.com/blog/efficient-smtp-relay-infrastructure-with-postfix-and-load-balancers/

Currently the service name for dovecot was hardcoded in the image, which
makes it incompatible with MoK. As a result this patch updates the image
to allow a dynamic overwrite on startup as well as updating MoK to
account for the new functionality.

This patch should allow to build and deploy container images centrally
helping to reduce the number of repositories that require eyes on them.