[imp] IMP displays both Plaintext and HTML

[Jens Pranaitis]

> FWIW this message displays fine here in both Horde 4 and 5. Michael
> might be able to say more about the log.

Just to make sure we're on the same page here: The message renders 
correctly for me as well. My problem is having both plain text and html 
displayed at the same time. Especially with longer message this can be 
frustrating. I attached a screenshot of the test message to this mail.
-- 
IKM-Serviceteam der Philosophischen Fakultät
HHU Düsseldorf
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