-- Microsoft Exchange Server 2010 is sending an invalid MDN when the AS1 message is downloaded from the server.

* This behvaior is NOT caused by a flaw in the AS1 implementation of Interchange or Activator.
* This behavior is caused by programming logic in the Microsoft Exchange Server 2010 software that sends a "Read" receipt upon delivery to a POP or IMAP client.  
* This setting can be changed but is non-obvious as it must be set via a Powershell cmdlet.  
* AS1 specification requires that the MDN be generated by the client, not the server, and only generated upon decryption and signature verification.  
* Therefore the Microsoft Exchange 2010 Server, in its default installed state, is not an AS1 compliant mail server.
* http://technet.microsoft.com/en-us/library/aa997154.aspx provides information on several POP settings, including SuppressReadReceipt which will stop the Exchange server from sending an MDN upon download of the message.  This should ensure that only MDN's generated by Gateway Interchange or Activator are sent back to the trading partner.

1. Review http://technet.microsoft.com/en-us/library/aa997154.aspx for infomation on how to use the Set-PopSettings cmdlet to enable the SuppressReadReceipt setting, which will stop the Exchange server from sending an MDN upon download of the message.
a. Axway does not provide support for Microsoft Exchange Server settings or configurations.  Before you make any changes to your configuration, ensure that you are aware of any possible issues.
b. Contact Microsoft Support for any additional support with configuring Microsoft Exchange Server 2010 to perform in  an AS1 compatible manner

2. Use the Set-PopSettings cmdlet to set the SupressReadReceipt flag.
a. cmdlet syntax: Set-PopSettings -SuppressReadReceipt true
b. To simulate this cmdlet, append the -whatif switch: Set-PopSettings -SuppressReadReceipt true -whatif