My local cable ISP doesn't allow incoming or outgoing connections to port 25, nor incoming connections to port 80. So at least for now, I can't run a mail server in my home. I've thought about switching to DSL, but then I would take a major hit in speed, in both directions.
Luckily, I have another option. There's a hosting provider where I live (Wichita, Kansas) that offers KVM-based virtual machine hosting. So I'll get a VM there, and if the service is any good, I'll move there from Linode. The pricing isn't competitive with Linode, let alone DigitalOcean, and I doubt that the connectivity is as good, since the server will be in a building here in Wichita rather than a real data center. But I'm willing to try it, in order to support a local business and fight the centralization of the Internet.