In the code for this page, almost the entire message is all on line 135.
try breaking that up so it is not all on one line.
an email message can only contain a certain number of characters per line, so the email script will need to break the lines dynamically.
in the source of the message, i am seeing that a "!" is being inserted for the link and for the broken image, my thinking is that this is being added due to the amount of reformatting that needs to happen at run since the message is all on one line.
if you format the message source so it is not all on the one line, it will cut down the amount of server processing needed.