'Process a BODY command.  Argument:
- id: article number or message id
- file: Filename string or file object to store the article in
Returns:
- resp: server response if successful
- nr: article number
- id: message id
- list: the lines of the article\'s body or an empty list
if file was used'

def body(self, id, file=None):

    return self.artcmd(('BODY    ' + id), file)
