Xara Designer Pro 16 unable to use the contact page in template

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Hi Folks

I'm using Designer pro 16 and template 73.

I'm trying to get the contact page to work, the site is working but the contact page is not.
I have changes the setting in the place holder as per the instructions but every test just delivers me the "Your message was not sent"
It has been uploaded to the site and we have php running.

any help would be gratefully received. Thanks Ian