[[!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.
"""]]
