MailMsg - COM Class
The MailMsg COM class represents a message as it proceeds through the SMTP service.
- The information within the MailMsg object is persisted to some physical location such as the file system using objects and file handles provided by the installed store driver object.
- The MailMsg COM class is integral to the SMTP service and does not need to be implemented.
- Transport and protocol event sinks use references to a MailMsg object to access information about the message and the message contents as it proceeds through the service to its final destination.
MailMsg - CoClass
CLSID : 39b16f50-a8ba-11d1-aa91-00aa006bc80b
ProgID : Exchange.MailMsg
Inproc Server : %SystemRoot%\System32\inetsrv\mailmsg.dll
For more detailed information, please read this article.