By default, the DEFAULT user domain is managed with this utility.
    To manage a different user domain, select that domain with the
    SET DOMAIN command.

    For example, to manage the EXAMPLE.COM domain, specify

    popstore> SET
    Using the "default" user domain
    ...
    popstore> SET DOMAIN EXAMPLE.COM
    popstore> SET
    Using the "example.com" user domain
    ...
    popstore>