How to Globally Enable HTML for CF7 Mails

If you do not want to enable “Use HTML” for every contact form 7 forms, then you can use the following code snippet:

function we_cf7_always_use_html($cf){

    $wpcf7 = WPCF7_ContactForm::get_current();
    $submission = WPCF7_Submission::get_instance();
    if (!$submission){
        return;
    }

    $mail2 = $wpcf7->prop('mail_2');
    if(!empty($mail2)) {
    	$mail2['use_html'] = true;
    	$wpcf7->set_properties( array("mail_2" => $mail2)) ;
    }
}
add_action( 'wpcf7_before_send_mail', 'we_cf7_always_use_html' );

This will globally enable the use_html filter for all mails.