Can you still just hook up a mail server and send away, I doubt anyone will accept your messages? I thought that in the interests of spam reduction people only accept messages from addresses they "know". I guess you will be able to use your ISP's mail relay but I would think they will charge you for the privilege. For home broadband, probably won't do it at all. It's been a while since I was involved in this but I can't see it having got more open over the years.
You could in principle use dynamic dns if you didn't have a stat ip.