When POSTing from vb, I get the error "unable to parse fax envelope". The POST payload looks exactly the same as the one I am sending from the REST client which works fine.

It took a while to realize that I should only use Line Feeds "Chr(10)" and not Carriage Returns "Chr(13)" !!!

I searched this site looking for an answer, but I guess no one else had run into this problem before.

Hopefully, this will save the next person some time.