Mail server install questions

[Gerben Wierda]

So, I’m back to my (slow) migration of an existing macOS High Sierra + Server.app Apple-’supported’ mail server to one based on macOS Mojave + Server.app + macports. Server.app is running. DNS is running. Users are in OpenDirectory. Their backup home directories (synced with clients) are available. Now it’s time to migrate the mail server. That is (as on High Sierra): postfix + dovecot + spamassasin + clamav + greylisting. But while I’m at it I’d like to enable DMARC at least. I’m used to managing the configuration by editing files (such as main.cf and master.cf, whitelists, etc.) at the unix level. A user-friendly way to manage sieve filtering by end-users would be nice (I had roundcube once, have been editing the sieve file by hand since then on the server).

I have a few questions that arose during preparation (mostly because I was unable to find documentation for the port):
I was looking at available documentation. There is a mail-server ‘aggregate’, but it wants X11. Why?
How do I find out what variants I need. Definitely pure, but for instance do I need a variant that can use the local Open Directory for authentication (postfix and dovecot) and if so, how do I find out? 
Why does the dovecot port add users/group that already exist on macOS (_dovecot, _dovenull)?
Why would I add lucene etc. if all searching and indexing happens on the client side (Mail.app, spotlight)?
I looked at installs for postfix and I noticed in the last year it has been installed only once. Is that right? dovecot2 has 2. dovecot2 has no maintainer. I find wiki pages, but then they are often unfinished/incomplete. Makes me wonder: is there any volume in this community or will I be effectively be the only one?

Gerben Wierda
Chess and the Art of Enterprise Architecture <http://enterprisechess.com/>
Mastering ArchiMate <http://masteringarchimate.com/>
Architecture for Real Enterprises <https://www.infoworld.com/blog/architecture-for-real-enterprises/> at InfoWorld
On Slippery Ice <https://eapj.org/on-slippery-ice/> at EAPJ

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