Heya!
I understand this is a bit of a tricky situation, so let's see what we can do to help!
Unfortunately, If you have forgotten the e-mail that is currently setup on the Jagex account this is not something we can reveal to you.
Your login email is visible on the account settings here, which you may be able to access if you're already logged in. If not it may be on the auto-fill on the linked webpage.
I would also recommend looking at any e-mail you've previously used on any of your RuneScape accounts, and checking for previous Jagex account verification codes that have been sent - the subject line will be "##### is your Jagex verification code" where ##### is the code.
Unfortunately, if you cannot find it, I'm afraid there isn't anything fu...
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