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The default authorizations allow MMDF to deliver a message if either the user-based or host-based authorization tables allow it. Thus, if a user table authorizes a user to send mail over a channel, but the host table does not, that user can still use the channel (and vice versa).
To require that both the user and host tables authorize access to a channel, specify auth=hau in the MCHN definition in /usr/mmdf/mmdftailor.