I need a best practice suggestions related to my FQDN for my server that's also the Postfix $mydestination

I remember naming servers after planets in 2003. After we got to jupiter.server we couldn’t remember which servers provided which services.

The virtual servers I host are small & low traffic. I probably should rearrange everything to spin off services to their own servers but my servers are in different data centres and aren’t struggling at the moment.

However SSL certificates are presenting problems when web1.domain.tld also hosts domain.tld. What do you do then?

At UB, our local God of IT and Prof. for Operating Systems in CSE named his servers in our department after Dr. Zeuss characters. I had no Idea till I asked cause I didn’t have those books in my life.