I'm looking to set up a few email distribution lists using my own domain rather than Google groups or similar. I used to use SmarterMail which had a module for mailing groups.

The only work around I've found so far is creating an email alias that then forwards to a list that I've created.

Are there any PHP scripts I can load or install that can do what I am looking for, or even any third party services where I can use my own domain?