We have noticed a problem where if you are the cc recipient of an e-mail and hit reply all, it keeps your e-mail as a recipient in the cc field. This causes you to receive a copy of the e-mail you just sent because it was also sent to you. It works correctly and does not act like this when you are the recipient listed in the "to" field; just the cc, and maybe the bcc (haven't tested the bcc, usually bcc recipients don't reply all, defeats the purpose of the bcc haha).