...
body: the content for the confirmation email.
template: the template for the confirmation email.
subject: the subject for the confirmation email. (Not required, default: 'Confirmation of filling out contact form via
%{site}')
Note: Only 1 of the arguments body and template is allowed at the same time.
Note: This tag does not replace the tag 'register_form_field', so to activate a field in the form, you still have to use the 'register_form_field' tag.
Note: This tag has a gracious error handling, meaning that if a field that is registered as confirmation_field is not given, or does not contain a valid email address, the confirmation mail will not be sent.
...