I have temporarily set a test 'straight from the box' Contact Form SP (with HTML Editor applied) to send to the address you supplied, at:
Hopefully you will see the errors that we are seeing, or perhaps even more hopefully, you won't. Either way, a step forward.
Attached zip of WAUE files
EDIT:: - Have just set up a HTML Editor form to email with same presets and link, and this (without using UE) sends link OK - so this absolves HTML Editor of contributary blame!