mailbox . ... email.message.Message . ... Add message and return assigned key. get_file (self, key) . ... Change the messages that correspond to certain keys. values (self) . ... Return a Message representation of visible headers. remove_label (self, label) . ... set_payload () instead. del_param (self, param, header ='content-type' , requote =True ) . ... Return the parameter value if found in the Content-Type header. ... Return a count of messages in the mailbox. __setitem__ (self, key, message) . ...