If the NBA blocks an end-user trying to send an email or Webmail, browse to a Web page, or upload a file, the end‑user is notified accordingly. But if the NBA blocks a user’s comment in an IM conversation, the user is not made aware of the blocking although the receiver may see the comment censored with asterisks.
When the user attempts to send the email, it is not sent and they receive a notification email. The exact handling varies according to the email or Webmail application.
Initially, the user may see a message such as ‘Error Sending Message’ or ‘We can't connect to Windows Live Hotmail right now.’
Subsequently, the user receives a notification email, explaining that their original email has been blocked. The notification arrives shortly in the inbox of whichever application they used to send the original (Outlook, Notes, Hotmail, and so on).
If a comment in an IM conversation gets blocked, the person who posted the comment is not made aware of the blocking and assumes it was sent normally. But the other participants only see a censored version of the comment, with all text replaced by asterisks.
If a Web page or file upload gets blocked, the NBA notifies the user either by displaying a dialog (or HTML file) containing an explanatory message or it redirects the user to an alternative Web page containing an explanatory message (typically on the corporate intranet).
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