Chronoforms to the rescue. Thank you. An easy to use and very flexible extension. I was frustrated like so many others (in the forums) that the contact forms built into Joomla sent messages back from the e-mail settings of the site, rather than from the e-mail address entered into a form. With Chronoforms, I've overcome this problem. Leaving the static from blank and using the dynamic from field, means that any form received if from the person entering their e-mail into a form, not from the site. Excellent, especially as this means I can just click reply to the form message and it goes to the respondee.
Chronoforms is easy to install, manage and once you get into the way the processing works, it's easy. Two Wizards make that process even easier. A great bit of software, thanks.