Postfix 2.7.0 released at February 13, 2010. More info http://www.postfix.org/announcements/postfix-2.7.0.html
Postfix 2.7.1 released on June 8, 2010 More info: http://www.postfix.org/announcements/postfix-2.7.1.html
I've added 2.7.1 to the tree.