barnez on "[Plugin: Contact Form 7] Were does the visitor send the contactform from?"

http://contactform7.com/special-mail-tags/

[_post_id] This tag will be replaced by the ID of the post which contains the contact form.
[_post_name] This tag will be replaced by the name (slug) of the post which contains the contact form.
[_post_title] This tag will be replaced by the title of the post which contains the contact form.

Note that the [_post_*] tag has value only when you put the contact form into content of a post or a page. They are not available if the contact form is put inside a sidebar widget.