I was working on a project and found it hard to understand how Google Groups mailing works. So here is a tip on how to automatically unsubscribe from a Basic Edition Google Apps Group.
When you receive an email from a Google Apps Group, if you want to unsubscribe, simply reply to the Group’s email address it came from with a subject line ‘unsubscribe’. NOTICE, not the email it came from, but the Group’s email address.
For example, when you receive an email from a Google Group, it looks like this:
TO: email@example.com (NOTICE: it does not have your email address, but rather only Group’s email address)
SUBJECT: Hello World
To leave the Member List, reply using the email it came on:
You should shortly receive an email notification that would look similar to ‘firstname.lastname@example.org’ confirming that you have successfully unsubscribed.