Add Quickmail Block by Default

1) Open  "moodleroot/course/format/topics/lib.php"

2) Add "Quickmail" block to the following functions:

public function get_default_blocks()  {
    return array(
        BLOCK_POS_LEFT => array(),
        BLOCK_POS_RIGHT => array('search_forums', 'news_items', 'calendar_upcoming', 'recent_activity' , 'quickmail')