I speak from experience that no one other than professionals should be handling their own mail servers in 2024. I worked for a mail host. The amount of spam and attacks that befall a mail provider, even a small one, is bonkers. Plus, mail is just too damn important.
I wish it wasn’t the case because the idea of everyone privately hosting their own mail servers would be pretty awesome. Sadly the modern internet makes it way too risky.
Just give me an AGP slot on my phone. Hell, toss in a SCSI while you’re at it.