There is a fully archived ONETEP user mailing list which is hosted by the JISCmail server.
You can subscribe to the ONETEP mailing list
Once subscribed, post to the mailing list by sending your email to ONETEP ‘at’ jiscmail.ac.uk
Note that you must register in order to post emails to this list and to search the list archives. Emails from non-registered users will be deleted automatically.
Once registered, you can access the ONETEP mailing list archive
Where links in old forum posts refer to the old ONETEP website at www2.tcm.phy.cam.ac.uk please substitute www.onetep.org to get the equivalent page on the current site.