To just stop e-mails

If you go to the JISCMail site for this mailing list.

https://www.jiscmail.ac.uk/cgi-bin/webadmin?A0=OCTEL-PUBLIC&X=706F21411EF86B7712

Create a JISCMail account with your e-mail address you will be able to subscribe or unsubscribe as needed or subscribe to digests.

Or

send an email to listserv@jiscmail.ac.uk with no subject and the command in the body of the email. […]