Does anyone on Hacker News who still uses Gmail expect privacy?
While looking for that second date, I dug up a piece of spamming + domain hoarding history:
https://groups.google.com/forum/#!msg/comp.protocols.tcp-ip....
(Note the date of that post and what domain shows up in his list...)
If you need to use your own domain, set up your own server or VPS and install https://kolab.org/ (it's all listed on https://prism-break.org/)