It’s strange. When you visit a Google Group and are not logged into your
Google Account (if you even have one) you might get the impression that you
cannot join that group. If you’re already a member of such a group, you’ve
perhaps noticed that you can unsubscribe from it using a
<groupname>+unsubscribe@googlegroups.com email address. At first I
thought replacing “unsubscribe” with “subscribe” would allow me to join
<groupname>, but for some reason Google didn’t stick to that pattern. Instead it’s
<groupname>-subscribe@googlegroups.com …
Why such a link isn’t shown on each group page is beyond me, but at least it is hidden in the the documentation.
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Alternatively, this website also supports Webmentions. If you write a post on a blog that supports this technique, I should get notified about your link 🙂