...
Mail server visibility
The reactionner launch launches notification plugins in order to notify contacts from host or checks alerts. Notification plugins are mainly based on the mail system, and so the reactionner server need a local MTA configured to relay emails to the contacts. The MTA configuration is up to the administrators.
...
The reactionner get command from the schedulers.
It do not known about contacts. It only get commands to execute, and the commands are created by the schedulers.
Reactionner connexion summary
...