Kai Schaetzl a écrit : > Ralph Angenendt wrote on Tue, 14 Oct 2008 17:24:08 +0200: > >> If you don't know the smallest MTU on the path to the mail server, you >> might not be able to send packets over that path, especially if DF is >> set. > > But if it's not set? Shouldn't most devices have it not set? > It's not per device. It's a method to improve performances. http://www.znep.com/~marcs/mtu/