
Not all mail systems honor the various headers that an email client can use to request return receipts, so absence of a receipt doesn't necessarily mean that the recipient didn't read the message. A read receipt simply means that the email client displayed the message, not that the recipient read or understood it. Outlook marks a message as read when someone opens the message, or when the message remains in the preview pane too long.


Read receipts aren't a reliable indication of whether a user actually reads a message Outlook generates them when it marks the message as read. I've heard about a Group Policy setting for Microsoft Office Outlook 2003 that forces the generation of read receipts, but how can I force receipt generation for Microsoft Outlook Web Access (OWA)? I want to force the use of read receipts for all internal email.
