Paula wrote:

Upon researching further, that may not be the problem in the regard
that he also receives other emails which are Bcc and those are coming
in fine. We also just did a self test using Bcc and it came through
fine.

The problem you describe doesn't ALWAYS occur. Microsoft claims it doesn't
happen when Outlook is both the sending and receiving application, so trying
to test it yourself may not produce the issue. Moreover, if the message is
not HTML, even if you are Bcc'd, you won't see the problem. If the messages
you say look fine are Plain Text or Rich Text, that explains why they appear
OK.
--
Brian Tillman [MVP-Outlook]