I use a cheap VPS to host my email server. It's a bit easier than running it solely at home, but there's a lot of annoying work to "verify" yourself. Once you get your DNS records good, you shouldn't be blocked after that (unlike a home server). It only costs me $5/month plus the domain, which I think is money well spent. Doing the admin work to make sure I'm secure still needs to happen, but I don't mind that work and find it fun.