Comment 2 for bug 1089342

Postfix gets used in many different situations in Ubuntu since it is the default MTA. In many of these cases, using the privacy extensions is perfectly appropriate, so I don't think that making this change by default is appropriate. For traditional MTA applications, I agree it should be set and it might be nice to provide this as a configuration option (I did get burned by this too the first time I set up postfix on an IPv6 connected host).