Retrieving account information

Hello, like most of you (I assume) I have about 20 gazillion crossfire accounts to avoid banning for hacks and such. Well, my main account started out as a hacking account, but I don't hack anymore. I want to delete my current clan, BUT, because I didn't pay any attention whilst creating the account, I no longer know what email it is registered to, so I can't retrieve my security question answer or the account creation date. ( I registered all my accounts under the same gmail address but with periods in between, eg. john.smith - jo.hn.s.mit.h)
So, my question is, how do I retrieve the registered email address without having any account information other than ID and pass?

Thanks in advance