BUG: CDO (1.21) Copies Unnecessary Properties in Forwarding and Replying

If a Collaboration Data Objects (CDO 1.21) application receives a message from a POP3 user in the site and replies to or forwards the message to a non-existent Internet recipient, a non-delivery report (NDR) may be sent to the POP3 user. In addition, if a CDO (1.21) application replies to a message from an Internet message that includes a "Reply-To" field, CDO (1.21) copies the "Reply-To" field to the reply message.

CDO (1.21) copies unnecessary MAPI properties to new messages in Forward, Reply and ReplyAll methods.

To resolve this problem, obtain the latest service pack for Exchange Server version 5.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base: The English version of this fix should have the following file attributes or later:

Component: CDO (1.21)

Microsoft has confirmed that this is a problem in Collaboration Data Objects (CDO) version 1.21. This problem was first corrected in Exchange Server 5.5 Service Pack 3.