Notification messages From: address 

example.gif The content filter automatically generates notification messages that are sent to the user, sender and/or intended recipient. You can specify the email address that you want to appear in the From: field. The address you specify for this field is global. The same address is used for all notification messages.

1.    Make the Content Filter/Set Global Options page active.

2.    In the "From" address used in notifications: field, enter the email address that you want to appear in the From: field of the email notifications users receive.

See also:

Options for all policies