Migadu! Prices are fair in my opinion, and it’s bring your own email client (ie no webmail iirc) and bring your own domain… They also feel less “corporate-y” than Tuta or Proton. I have accounts with all three but I like migadu the most. If something happens, I don’t lose all my emails/need to change emails cause my email will still be JetpackJackson@<domain name>. Also, if you’re a student, they have a discount that you can email them about.

Also, Disroot is cool too but I don’t use them that much since I have three other emails to deal with lol

Currently using Jekyll but working on switching to Haunt cause I like Scheme

I hear XMPP through Snikket is pretty easy. I just used prosody though

Migadu hosts it all for you, you don’t need postman or the like. I don’t recall how many addresses you can make at the moment

For email, you can get Migadu and use your domain (in fact, I think that’s their only option unless I’m mistaken ie no foo(at)migadu.com). I’m biased cause I use them but I think their prices are fair and they have a student discount, if that applies to you. It works with K9 nicely.

For gallery, I use Aves Libre.

Also idk if I missed it but if you’re looking for a calendar the Fossify calendar is good.