i'm to end an on going problem. Every few months I get an error msg when I login to my email. Username and/or password doesn't match. In the past, I simply inactivated that one email account, then re activated it, without changing anything, and all was good. Today I chose to change my password, did that, it was accepted. I also chose to set up a new account to divide recreational emails that include digests, from single emails. What are the email username guidelines? Can I use numbers, underscore, and letters to form a new email address. to end up with something like. email@example.com?