Please attach a copy of the message.
If you attach a copy of the RFC822 message in question, we may be able to diagnose the problem. (You can get the original message body by right-clicking on the message and selecting "Show Original".)
Sorry to ask for this again...
It'd be much easier if you could attach the problematic message to your posting as a file attachment.
From the web UI, right-click on the message and "Show Original" will get you the original RFC822 message. Save the message as a .txt file. Then, in the forums, write a posting and use "Additional Options > Attach Files" to add the attachment.