stop fallback to native wp_mail()

FYI I’m currently using this, though a filter would be more elegant.

add_filter( 'wp_mail', 'filter_wp_mail' );
function filter_wp_mail( $args ) {

	// Check backtrace
	$backtrace = debug_backtrace();
	foreach ( $backtrace as $item ) :

		// Is this filter is being applied by wpMandrill::wp_mail_native()?
		if ( ! empty( $item['class'] ) && $item['class'] == 'wpMandrill' &&
			 ! empty( $item['function'] ) && $item['function'] == 'wp_mail_native' ) :

			// If so, abort email
			$args['to'] = array();

		endif;

	endforeach;

	return $args;

}

Hi @gyrus , the cleanest way we saw to do this was to wrap the wp_mail_native function from the plugin in an ‘action’. You can now just add a ‘remove_action’ function on your site in order to prevent the native wp_mail function from running when this plugin is active. See the pull request for more details. Thanks!

https://github.com/Miller-Media/send-emails-with-mandrill/pull/13