lkcl@lkcl.net goes to libre-soc.org where exim forwards it to luke.leighton@gmail.com and gmail then may bounce it if the original sending domain has a SPF hard fail policy - as mail from that domain (eg phcomp.co.uk) should not come from there. The bounce message is sent from libre-soc.org with text from gmail
alain i'm going to need help with the bind zone files in /etc/bind i can't get them working properly.
i think i have it, i re-enabled DKIM. messages seem to be getting through.