Pick up files from a directory into the broker
The file-drop road into MailerQ, for senders that cannot speak SMTP or AMQP.
In detail
The engine has a spool directory of its own for the same purpose, so this is the version for feeding a broker that a MailerQ node reads, rather than the node's own disk. For Hub it is a compatibility path worth remembering: a customer migrating from a system that writes files can keep doing so while we move them onto our exporter.