There are a few options for this.
You can do it through mailing lists - Constant Contact or Aweber
Also you can search Google for SMTP server and subscribe to monthley service
Or you can download SMTP software and run it your self or if you have a Server version of Windows run it through Windows yourself.
I had the same limit of 250 and it sucks. I just started my own SMTP server because I'm a geek and it seemed like more fun.
Depending on your computer skills you may just want to use an SMTP service. I never used any so I can't speak on behalf of any, but they are out there.