| http://www.w3.org/ns/prov#value | - If stderr is specified, output will be written to stderr. (This is useful if you are running spamd under the daemontools package.) With a facility of file, all output goes to spamd.log. facility is interpreted as a file name to log to if it contains any characters except a-z and 0-9. null disables logging completely (used internally).
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