[[!comment format=mdwn username="spwhitton" avatar="http://cdn.libravatar.org/avatar/9c3f08f80e67733fd506c353239569eb" subject="comment 2" date="2018-08-10T10:36:35Z" content=""" Could you explain why it's right to not use the full hostname, please? Careless use of `Hostname.sane` on my part recently broke my mail sending setup. I discovered that I am relying on /etc/mailname containing the full hostname, but maybe I should not be doing that. """]]