Hook для получения данных из форм Contact Form 7

add_action( 'wpcf7_mail_sent', 'your_wpcf7_mail_sent_function' );
function your_wpcf7_mail_sent_function( $contact_form ) {
    $title = $contact_form->title;
    $submission = WPCF7_Submission::get_instance();
    $posted_data = $submission->get_posted_data();
}