Just signed upto the London Devops mailing list, and thought I'd just point out that one does not need a google account to join a google groups hosted list. Just send an email to the <list-name>+subscribe@googlegroups.com with 'subscribe' in the subject line of the email, and their list managment software will sign you up.
So in this case, sending an email with:
To: london-devops+subscribe@googlegroups.com
Subject: Subscribe
.. would be all thats needed to get you on there.
Google groups has a help page with details on what all services they host which dont need a google account to use.
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