I currently pay 70$ a month for residential 50/50 Ziply fiber internet in Oregon. On the ziply website it says it would be 50$ a month for 100/100 small business fiber. Would that let me get a static IP, port 25 unblocked and reverse dns? Are there any strings attached as it seems strange for small business internet to be cheaper than residential?
Just as a heads up, running your own email server is rife with pitfalls. Even if you set everything up perfectly (which is unlikely for a first timer), you will still run into issues with your mail not being delivered because the big email providers will assume your stuff is spam.
There are guides for doing that, but it really isn’t worth the hassle.
Also, getting a domain name and using dynamic DNS has worked fine for me for years, and I’ve had no reason to pay extra for a static IP.