def __init__(self, send_at=None, p=None):
self._send_at = None<EOL>self._personalization = None<EOL>if send_at is not None:<EOL><INDENT>self.send_at = send_at<EOL><DEDENT>if p is not None:<EOL><INDENT>self.personalization = p<EOL><DEDENT>
Create a unix timestamp specifying when your email should
        be delivered.

        :param send_at: Unix timestamp
        :type send_at: integer
        :param name: p is the Personalization object or Personalization object
                     index
        :type name: Personalization, integer, optional