For my servers I try to use names from the Final Fantasy universe. Lately been focusing on FFXI end game bosses.
Kirin (opnsense firewall) Byakko (proxmox host) Tiamat (proxmox backup) Shiva (Nas)
The only clever virtual machine names I care to brag about are: DockBox (VM running docker) Jellxc (proxmox lxc running jellyfin)
I didn’t like that Tuta didn’t support IMAP which means I am locked in to using their client. I self host my own CalDAV and carddav servers for calendar and contacts and wanted a single client for mail/calendar/contacts. Without IMAP support I could not do that. I ended up going with fastmail and am okay with the privacy tradeoff of no end to end encryption.