The email address of the sender

        :param value: The email address of the sender
        :type value: From, str, tuple

def from_email(self, value):
        """The email address of the sender

        :param value: The email address of the sender
        :type value: From, str, tuple
        """
        if isinstance(value, str):
            value = From(value, None)
        if isinstance(value, tuple):
            value = From(value[0], value[1])
        self._from_email = value