def get_member(email):
    """Get the member for the given address.

        *Note* that it is possible for an email to be subscribed to a
        mailing list twice, once through its explicit address and once
        indirectly through a user's preferred address.  In this case,
        this API always returns the explicit address.  Use
        ``get_memberships()`` to return them all.

        :param email: The email address to search for.
        :type email: string
        :return: The member if found, otherwise None
        :rtype: `IMember` or None
        """
