Message tracking error

Hi All,

I'm trying to track down a problem sending emails to a domain. Message logging seems fine for most messages, however when I try to open the Message History for problem emails, I get a dialogue box:

"The object 'and/or' in the message tracking logs can't be found in the directory. the object may have been deleted. The tracking history may be incorect."

Any idea why this message is appearing?

Adrian
.