The ongoing issues with JISCMail that affected the LIHNN mailing list now appear to be resolved. 

Statement from JISCMail: "At 16:46 yesterday (19/1/23), we received notification that the software vendors had been able to un-block communications from Microsoft365-based email domains, enabling email traffic to start flowing again.

There's quite a queue that's built-up over the last week-or-so, so messages may take a while to come through, but early indications are that they ARE coming through." 

The latest information is available here https://www.jiscmail.ac.uk/20230111-ServiceDisruption.html