Damn, this is a paradox. When I simply hit the reply button, and send a message without erasing the original messages, my message gets scrubbed by default along with the supposed "HTML attachment" - I didn't add an attachment to my email, so I assume it's referring to the old messages.
However, when I send my reply like this (on its own,having erased the original messages) , it often doesn't appear on the list!

It's all very confusing!

Angeline