def _get_sender(self, sender):
if isinstance(sender, tuple):<EOL><INDENT>return "<STR_LIT>" % sender, sender[<NUM_LIT:0>], sender[<NUM_LIT:1>]<EOL><DEDENT>else:<EOL><INDENT>return sender, sender, sender<EOL><DEDENT>
Return a tuple of 3 elements
    0: the email signature "Me <email@me.com>"
    1: the name "Me"
    2: the email address "email@me.com"

if sender is an email string, all 3 elements will be the email address