The problem – you want to subscribe to an online newsletter, but they don’t offer an RSS or Atom feed. You don’t want to disclose your personal email address.
You can use the following service to set up a ‘bridge’ between a nominated email address and an RSS feed. Then you can simply subscribe to the RSS link that the you are provided with:
Emails to RSS Forwarding
It takes a little bit of setting up, but it does solve the specific problem described above.