I asked an SRE intern if they ran their own server. Said no; but at least they had their own VPS. Made me realize how much I've learned by maintaining a home server for the past 16 years.
While I don't run my own email anymore I still have secondary DNS, NFS, Plex, Docker, IPv6 tunnel and local LAMP stack for projects.
I can highly recommend the Supermicro you see here. 20-30w at idle, super quiet, 8 cores, up to 128GB of RAM, 10GbE, NVMe and much more. I've been running this for 7 months now and it was a big improvement over the Rackable I used to run.