The paid proton accounts let you use several custom domains, although I’m not sure if you can combine custom domains with email aliases. For random sites the email alias with the stand @proton.me would probably suit your needs.
After about 3 years of use I’ve been very happy with proton’s spam filtering.
I’ve had pretty good luck running llamafile on my laptop. The speeds aren’t super fast, and I can only use the models that are Mistral 7B and smaller, but the results are good enough for casual use and general R and Python code.
Edit: my laptop doesn’t have a dedicated GPU, and I don’t think llamafile has support for Intel GPUs yet. CPU inference is still pretty quick.