Contact Form 7 auto added p tags

If editing wp-config.php is not the solution for you, there's a handy filter. Put it in your functions.php:

// Remove <p> and <br/> from Contact Form 7
add_filter('wpcf7_autop_or_not', '__return_false');

According to the Contact Form 7 Docs, you can disable "wpautop" for the plugin by placing the following constant in wp-config.php:

define( 'WPCF7_AUTOP', false );