HTMLText property will return part of the message that
has content-type of text/html. It
could be whole message, but also any of its parts.
wodMailbox will search through all message parts until it
finds text/html part, and return it through this
property.
In specific occasions, if ContentType is
multipart/mixed, wodMailbox will go
one level deeper and check if any of parts have ContentType
of multipart/alternative - in which
case HTML content will be searched among those parts. This
is typical message with two parts (plaintext and html) and
attachment.
If HTML content is encoded, wodMailbox will decode it
before it returns it to you through this property.