Sending notification messages to users
You can send a notification message to a user, to all of the users associated with a BlackBerry Enterprise Server, or to all of the users in the BlackBerry Domain. You can send notifications as email messages or PIN messages. PIN messages are appropriate for informing users about messaging server outages because BlackBerry devices send and receive PIN messages directly, without using the messaging server. BlackBerry devices do not apply filters to PIN messages.
When users reply to a notification email message, their BlackBerry devices send the replies to the Windows account that you used to install the BlackBerry Enterprise Server (for example, besadmin).