In reality, you should be deleting the tickets themselves because they contain personal information. This can be done by configuring how long SmarterTrack should wait to delete a ticket after it is closed. When the ticket is purged, the attachments are deleted.
This does bring up potentially needing to provide auto cleaning functionality for other areas as well, such as chats and call logs.
Andrew Barker
Senior Software Developer
SmarterTools Inc.
www.smartertools.com