i run homeassistant, pihole, 2 projects of mine using NodeJS, nextcloud, a very simple static website and Nginx for some DNS customization like pointing nc.home to a specific port. My pi is a 4GB one and for now the used RAM is not even 1 GB. I run debian with no graphical interface

Yes.

Xmpp, irc, email and websites are all pretty small in terms of resource usage. Where you’ll have problems are with heavy compute workloads like 3d rendering, AI, 3d gaming (sorry, no crysis), and crypto mining. They all can be done on a rpi but not done well.

How long is a piece of string?

Slaps board of Pi this bad boy can fit so much fucking dust in it.

Anything she puts her mind to!

I serve several TB of Video movies, TV and music around the house. Jellyfin rocks.

It can do at least three calculations per second.

I love this distro

That he can do, indeed. Maybe even some pornhub too 😁

Since I tried zimaboard I would never go back to RPI, personal preference I know but I love it.

MySQL, pihole, nextcloud and secure pastebin. Bunch of dotnet and python apps. Also running a notification service.

If you **really** want to host your own email then grab a cheap/free domain name from somewhere and use that instead of your main domain/address for your testing ans setup

Do all your learning on that email account and domain name that you can throw away.
Once your comfortable then you can think about forgetting about moving your main address as it’s not worth the hassle! :-D

Sure it can, but it depends on what software you run and how much load you put on those services.

You can fit lots of stuff in 4gb of ram. Just pile on services till it starts running low.

There are a lot of factors that go into whether a big server like Google will accept your email, it’s so much work that it isn’t worth it unless you really have to. Just “self host” on proton mail or something