Hi,
Could one option be to configure the software in the monitoring station to send the email as rich text instead of HTML? Also, maybe this is a known error for the software in question and there is a software patch available? Have you approached the vendor/support for the monitoring software?
You say that you have approaching Microsoft and RIM - but in fact, the source file that is causing problems is originating from a third party, which maybe have seen the issue before.
Best regards,
Jesper Ståhle