Cannot decrypt HTML e-mails using PGP Desktop error: No PGP Information found

We have a shopping cart system that sends encrypted sale order e-mails using GNUpg... when we receive the notifications in Outlook we decrypt them with PGP.  

We recently changed the system over to send HTML based e-mail instead of plain text... we had to do this to be able to pull some things from the shopping cart database (bill name) into the subject of the e-mail.

Now PGP Desktop won't decrypt the messages.  It says "No PGP Information found", though you can quite easily see that the message is encrypted.

This has happened on 2 computers.  The keys are installed correctly and the two computers still decrypt the earlier messages that were sent in plain text.

Whats causing this?
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I tried to reproduce your problem on notepad and encountered the same error. Most probable reason I can guess is that while converting from plain text to HTML, either the PGP header is corrupted or the message footer.

Check these lines especially:

--------BEGIN PGP MESSAGE-----------

--------END PGP MESSAGE------------

Also try to encrypt an HTML message and note how the encrypted message looks like. Now match the spaces, blank lines etc in your previous encrypted messages.

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