DetachPipe™ makes it easy to send private files like white papers,
proposals and résumés, and to track how many times they were read, if
ever, and even see if they were deleted before being read.
http://www.detachpipe.com/
Just like email, attachments are NEVER public - they are ONLY
accessible to the sender and recipients. Just like email, recipients
can forward attachments, unless you check the Your Eyes Only™ option,
which prevents forwarding. This is ideal for sensitive business
documents, and even for developers to send software patches to
customers.
What's more, you can email large files without worrying about the
recipient's account quota and emails bouncing back, or the technical
hassle of copying files to an insecure public site.
The DetachPipe Add On for Microsoft Outlook automatically uploads
attachments to
www.DetachPipe.com, where they are securely stored. If
you delete or forward the original email, DetachPipe will delete the
uploaded attachment or grant access to the new recipients respectively.