Routhinator
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.
That would be an interesting list.
You fall into gravity wells, they don’t suck you.
Best way to understand is to get the mental image of spacetime as a 3d sheet like grid, where each object pushes down on it and creates a pit, or well. The bigger the object the deeper the well, and the more force you will need to stop yourself from sliding towards the object and propelling yourself back up the slope.