My experience is that the submission storage plugins are very robust and rarely fail to save a CF7 form submit.

They are not however always a good indication of CF7 sending emails. The green “Your message was sent successfully” message is a much clearer indicator that CF7 is sending the email.

The submission storage plugins appear to save a CF7 form submit even if the email is not sent due to a Javascript Conflict or unallowed From: email address.

This is partly why I think they are so often used by experienced WP users – they provide a robust record of all form submissions even when things go a little wrong.

http://wordpress.org/plugins/contact-form-7-dynamic-text-extension/

Contact Form 7 is an excellent WordPress plugin, and the CF7 DTX Plugin makes it even more awesome by adding dynamic content capabilities. While default values in Contact Form 7 are static. CF7 DTX lets you create pre-populated fields based on other values. Some examples might include:

Auto-filling a URL
Auto-filling a Post ID, title, or slug
Pre-populating a Product Number
Referencing other content on the site
Populating with post info
Populating with user info
Populating with custom fields
Any value you can write a shortcode for

There are many more case-specific examples. I searched for a solution, and there are some decent hacks out there. Many of them are explored in this forum topic: Contact Form 7 Input Fields Values as PHP Get-Viarables. However, they all involved hacking the current Contact Form 7 code, which means next time the plugin is updated their edits will be overwritten. That’s bad.

This Dynamic Text Extension plugin provides a more elegant solution that leaves the Contact Form 7 Plugin intact.

See also http://sevenspark.com/wordpress-plugins/how-to-dynamically-set-the-recipient-to-email-address-in-contact-form-7

See also http://sevenspark.com/tutorials/how-to-create-a-counter-for-contact-form-7

See also http://sevenspark.com/code/how-to-create-a-dynamic-wordpress-contact-form