On Unix platforms, you run the Message Agent (dbremote) as a daemon by supplying the -ud option. See -ud option Message Agent (dbremote).

The user name must have either REMOTE DBA authority or DBA authority. The maximum message length, as defined by the -l option, must be the same on all databases in the system. See Message Agent (dbremote) requirements.

For a complete list of dbremote options you can specify, see Message Agent (dbremote).