@jdaviescoates I did some quick and dirty tests and so far it seems to be okay. I received mails in my Gmail account and in several others from some small and mostly german providers. Mails arrive at my webhoster.
As I don't have an MS365 account I tested outlook.com Mail was accepted from server but was moved into spam folder. I marked it as no spam and next mail arrived. Guess thats okay for me. I also checked mails with attachments (pdf).
As I already mentioned, I am sending very few mails and like 99% are incoming mails. So its okay for me.
Yeah, I'm generally a bit scared of encryption unless it's all automated by some app like Signal or whatever. I'm always worried something will go wrong or I'll forget/ loose my pw and loose access to my own files. I tend to feel that in my own personal circumstances that is a greater risk than someone nefarious managing to access my unencrypted files, so I mostly just don't encrypt stuff.
But this sounds like a pretty good method of getting Ubuntu's full disk encryption set-up with Cloudron (so long as you store you passwords safely, like in a password manager and printed out on paper, and maybe somewhere else too for good measure):
You made the right decision, because using SSDs is a more productive solution than outdated HDDs. Especially since now you can find not new form factors, such as mSATA SSDs, which will be inexpensive. For example, the ROGOB 2TB mSATA SSD will cost you only $119. I think this is a fairly reasonable price.