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I have an older gmail account that I set up that I need access to. I know that I used my primary gmail address as the backup account, but I can't remember the username that I used.

I'd swear that I found somewhere in settings or somewhere that I saw this before; but I think there's a place that lets you see what other accounts are using your gmail account as the secondary account.

Any ideas?

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No offense intended, but I would hope that you can't find an answer to this question. If you do then I'd say Gmail has a rather significant security (or, at the very least, privacy) flaw. – raven Jul 7 '10 at 23:03
Did you get answer of this question? I am facing same issue. Please help. – Nauman Zubair Dec 18 '15 at 11:09
up vote 1 down vote accepted

AccountA = Older account AccountB = Primary account

So, what you're saying is that for AccountA, you listed AccountB as the alternate email? When you did that, Google (at least now they do) sent an email to your AccountB email from account-verification-noreply@google.com and had you verify the association. If you can find the email and click on the link within it, it should ask you to login to AccountA.

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If account A is pulling emails from account B using POP3 you can check on https://mail.google.com/mail/#settings/accounts.

If account B is forwarding emails to account A then you will have to find an email that was forwarded and check the to address. Perhaps searching for a type of email that would have been delivered to account b.

Account A = primary account being backed up to.

Account B = lost secondary account being backed up from.

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