Google will send you an email inviting you to the ibtracs-news group (this can take a few minutes).
Reply to that invite email. (You can just send the blank email message). Don't click the button in the email (doing so requires you to login with a Google Account), instead send an email by replying to the message.
Once you have sent the reply, you will receive a confirmation email in a few minutes that you are now a group member.
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