[TYPO3] mailform with cc to customer

[Felix Natter]

hi,

I would like to have a mailform the output of which is not only
sent to the specified target address but also to the e-mail address
that the customer entered into the form.

This doesn't seem to be possible with the plain "Form" CE that typo3
4.0 comes with. Can I tweak this with typoscript or else can I
hack the source without affecting the rest of typo3?

thanks!

-- 
Felix Natter