The string behind the + symbol can be any letters or numbers of any length, but, to easily keep track of rerolled accounts, we recommend using numbers. For example, if your Gmail account name was a salted e-mail would be name or name and so forth. To use a salted e-mail, you add a +string between the name and the portion of your e-mail address. Gmail accounts are highly recommended for rerolling because they can use salts, which basically allows you to use the same e-mail multiple times for registration.