http://www.bacula.org/5.2.x-manuals/en/main/main/Messages_Resource.html
It's configured in each daemon to handle messages. However, for File and Storage messages are usually sent to Director to be handled centrally.
Name: the name will be used to tie the defined resource to a job or daemon
Destination:
destination = message-type1, message-type2, message-type3, ...
or for those destinations that need and address specification (e.g. email):
destination = address = message-type1, message-type2, message-type3, ...