Delpoy Nextcloud with the Memories app. It's a google photos clone that has the Nextcloud ecosystem behind it which means you can replace Drive, Notes, Reader, Podcasts, Hangouts and more.
Its nice, but Memories app as part of Nextcloud is better and Nextcloud completes the rest of the Google suite (Drive, Calendar, Notes, Reader, Podcasts, Hangouts)
If you're going to put in the time, Nextcloud has more value.
The deb version is a pointer to the snap in their repos. Nothings being replaced, it no longer exists. The deb version of Firefox in Ubuntu repos is a wrapper that installs snap and has no binaries in it. Has been for 3 years or so.
I'll note that a number of groups and forums send mailing list like emails (google groups, django dev being a big one) and that notifications can be threaded from places like Github with the right client.
Thunderbird has good threading.
Roundcube webmail is also capable here. Though when I have had it working it didn't include sent messages... which is not great in my mind.
An interesting caveat I've found for self-hosting is that getting server hardware in Canada is harder now that several companies, most notably NewEgg, have decided that any equipment that might have a business use case requires a business account and license, meanwhile Americans can still buy things like rackmount hardware no issues.
You can still get rackmount stuff on Amazon, but fuck Bezos. I'd like a better option. I've found some places like AVADirect that will ship to Canada, but not any Canadian businesses that sell that stuff to normal Canadians.
Never mind, youtube faked me out. Looks like the new one will require a proxy