> > Which (autoconfig) you should either not be using on > servers, or you > > should be configuring your software properly to select the correct > > outbound address. > that's a bizarre statement. the distinction between a client > and a server is an artificial one. either autoconfig is > useful for all kinds of machines, or it's almost useless. You are correct when talking about IP networks in general, however Jeroen is talking about the public Internet, not IP networks in general. Of course another way to make this less bizarre is to stop using the word "server" to refer to two different things. Jeroen is saying that an IPv6 devices that wishes to advertise its IPv6 address for the purposes of receiving SMTP connection requests, should not be configured in such a way that its IPv6 host ID is randomly assigned. Of course you could try to dynamically update your reverse DNS to match the random host IDs but that creates corner cases and race conditions which can be entirely avoided just by making the publicly visible IPv6 address a static one. Jeroen further pointed out that there is no reason for an interface, which has been assigned a random host ID, to suffer with only one address because IPv6 makes it straightforward to have multiple addresses on an interface. BTW, I do agree with your general viewpoint of Internet email architecture; it is horribly ugly and broken. --Michael Dillon _______________________________________________ Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf