Dear all,
There appears to be a misconfiguration affecting all @oxlug.org mail forwarding; the mail servers for the domain are rejecting mail with a 'relaying denied' message. This appears to have been ongoing since at least 10pm last night but may have started earlier.
I have contacted our ISP to request that they investigate and restore service, and will provide an update when I hear anything.
Sorry for the inconvenience.
Best wishes, Dominic.