I was trying to join a Google Group for my university. I added my Yahoo email address and got an email on that Yahoo email saying "you requested to join a Google Group blah-blah-blah Join This Group" which has no problem since I requested it.

But when I click "Join This Group" button I was redirected to GoogleGroups page, there's a strange e-mail but it was on my name, I don't remember creating/using it ever. Instead of using my Yahoo email, it somehow found an email on my name and made that strange email subscribed to the group.

I don't remember that I created that strange email (eventhough it's on my name) and cookies etc. were not existed for sure. I clicked that email afterwards with clean browsers then again it uses that strange email.

How could that happen? Is there a security concern here?

Edit: Email address clarification: Let's say my name is John Doe. My Yahoo Email's format: [email protected] and that strange email is Gmail and its format is [email protected]

  • @pnuts no, I don't think so. It was a university department's message board.
    – tidalwave
    Sep 28, 2017 at 18:46

1 Answer 1


Do both email addresses exist on the same Google account in https://myaccount.google.com/email ?

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