Eh, don't be so sure.
Email is often drawn as something similar to the fediverse. ... but if you've ever tried to run a small Mailserver, you'll quickly find that "the big corps" have created a walled garden that'll keep the "small fish" out.
It's all based on what the big players view as your "reputation". This is based on proprietary metrics (usually how many emails you send), but your reputation will determine if the email is delivered or not.
You can find more information here.
... but the point is that one big corps consolidate and reach the size (in terms of traffic/content) like Hotmail, Gmail, yahoo, etc - they will not hesitate to squeeze out the smaller fediverse fish to force them into paying to use the bigger pond.
Sadly ... this is just business as usual.
I was also using jerboa (and beehaw hasn't upgraded, either).
I ended up exploring other apps and are really liking thunder (it reminds me of baconreader).
Another honorable mention is liftoff.
Tbh, I don't know why jerboa was released as "stable" but with a forced server upgrade. It seems a bit strong armed. Anyway, I'm thrilled that other applications exist, so I get the continued functionality I want w/o needing the admins to accommodate me.
Oh, I hope this (eventually) works with Skyrim VR!