I've lived in country where symmetric Ethernet connection is norm for ~15 years (yes, 15 years ago it was something like 10/10 Mbit/s and now it is 100/100 or even more Mbit/s) and white, unfiltered, static IPv4 costs about +$2/month as option.
Yes, it is for big city, but even small ones have something comparable, maybe slower like "3 years ago in big city".
Typical ISP firewall for these IPs are "Port 25 is closed". And it's all.
One problem - typically you can not get good PTR record, your back-resolve will be something like "ip12-45-67.pool34.isp.tld", which is pity for SMTP, but irrelevant for all other protocols.
Unfortunately, this country has started bloody war, and now I'm living in civilized 1-st world country with crappy DOCSIS connection and without static IP :(