SSO: what if previous email isn't known/available?

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http://ubuntuforums.org – I am using Ubuntu One and similar other services under email I am using currently. However, my previous forums account, user name Temmokan, I snow dissociated. What are my options if I can't access/know for sure its email account? I assume, that if Support end that account email, I still will be able to read it, thus proving my ownership, but I have no desire to change SSO account's email to old mentioned forums account name. Does that mean I have no chance to associate those posts with me? (Hardware)