[caddy]

Not really, I rented a box from hetzner and have ran mail-in-a-box for over a year now. The IP I was assigned was on the microsoft shitlist for a little bit, but I sent them an email explaining why I was using the server and they took me off the list. Also took a few emails to GMail to get off their spam filter, but a few emails to family and asking them to report not spam (around 3 emails) was all it took. The only server I've ever been rejected by is a corporate email server with very strict settings, but every other corporate email has been fine.