At work we block a bunch of TLDs like .icu, .xyz, .top, .live, .work, etc... because we only got spam from them.
I recently had to write an email to my local police station (xx@polizei.nrw.de) and their server was rejecting it because my IP (vultr) was on the "Proofpoint® Dynamic Reputation"-blacklist. I owned this single IPv4 for at least 3 years, so they whole vultr range must have been blocked by Proofpoint.
Great if you can't even contact your government because they are using some shitty blocklist product.
Personally, I run a mailcow instance with Rspamd and get only very few spam mails, albeit my email was being leaked in the ledger.com hack a few years ago. When I was still using mailbox.org, I got crypto spam mails (update your wallet yada yada) in my inbox twice a day. So just a configuration thing(?).
Gave up hosting my own, just not worth the headaches.
Especially annoying is that in some cases filters blocking my mail are used on the postmaster address too, so to resolve an issue I have to use my gmail address.
For low-volume home use, I definitely recommend just outsourcing SMTP to a company that does it professionally.
I wonder how this is legal. Then again, I guess them throwing snail mail into the trash or refusing to open letters from particular individuals (as an example) would carry a different weight than some technical solution that nobody understands acting badly, with no particular person really being "responsible" for it.
first, it seems unfair.
second, I just got a .cx and plan to use it for email, I hope I don't have issues with it.