So, finally, we've decided to go with Postfix, the more currently maintained.

DRP merged, so we're good :)

Current status: ZR has been decom, we now deploy credentials through from Vault.

apache2, apache2-data, apache2-utils can be deleted without any issue and impact on other packages.

Apache is still installed during new server provisioning,

A small note about why dedicated instances seem a better fit, here the resources consumed by a new container:

Now at https://github.com/docker/docker-ce/tree/master/components/cli/contrib/completion

With T727 closed, we don't currently have service requiring a shared MongoDB instance.

Not maintained anymore at Flockport level. At this stage, we can use as a base template to provision a standalone mail server ourself through Salt.

@Sandlayth Can you do some of the items noted in the previous comment?

IPv6 excluded (something rather important), this is done.