gistfile1.php

<?php

add_filter('newsletters_theme_before_wpmlcontent_replace', 'replace_wpmlcontent', 10, 1);

function replace_wpmlcontent($body = null) {
	//let's see if this is a post/page editing screen
	//if it is, we'll replace the [wpmlcontent] code in the newsletter theme with nothing
	
	if (preg_match("/(post\.php|post\-new\.php)/", $_SERVER['REQUEST_URI'], $matches)) {
		return preg_replace("/\[wpmlcontent\]/si", "", $body);
	}
	
	return $body;
}

?>