I suggest to all the traders, to change the emails in their accounts NOW. (if the registered emails are connected with other trackers/forums etc)
Each account must have a different email and a different username than the other accounts.

Don't wait to change it when you decide to trade the account.
It's too risky to change the email and trade the account after 5 minutes...
And of course it's even more risky to trade the account and the new owner to change the email !!!

It's safer to change the email NOW and to continue using the account from the same IP for a while. If you ever decide to trade/sell it in the future, you are taking a smaller risk.

But don't forget that trading accounts is always dangerous, so discuss with the other trader/seller the possibility the account to get banned.
Or deal with trusted guys, that always refund if an account gets disabled.