If you visit a discussion group hosted on Google Groups via web browser, you will notice that you’re asked to sign in with a Google Account or create a new Google Account when you want to join or subscribe to the group in order to receive the mailing list.
If you don’t want to register a Google Account, you can subscribe to the group via email.
To post to the group via email, send an email to canc...@googlegroups.com
To subscribe to the group via email, send an email to cancancan+subscribe@googlegroups.com
Tip: It’s possible to find the group’s email address by visiting the group web page on Google Groups, and click on “About this group” (or “more” on top right corner and select “About” in the drop down menu. Then, look for group email address in the heading of “Group email”.