def ehlo_lines(self, peer):
max_size = self.max_message_size(peer)<EOL>if max_size != None:<EOL><INDENT>return ('<STR_LIT>' % max_size,)<EOL><DEDENT>return ()<EOL>
Return an iterable for SMTP extensions to advertise after EHLO.
        By default support for SMTP SIZE extension will be announced if you set
        a max message size.