Robert,
It appears that the 'from' address is being deleted from the automatically generated form as well as the automatically generated message.
I used your ad but redirected the reply to myself and this is what I got:
This email was sent on behalf of Neil Wyatt, reply to email address [email protected], registered member of the Model Engineer website, regarding your Myford Metric Saddle Hand Wheel classified ad. Please be careful when responding to interest from a Classified ad.
This text appears when you click the send email link, and so it suggests someone is typing over this automatically generated message, rather than adding their message below it.
I have sent you a test email as well.
Neil
Edited By Neil Wyatt on 02/02/2017 09:09:19