When configuring a University of Cambridge (UK) email address, like
not_an_...@cam.ac.uk, there are approaching 100 hosts/domains and
relaying IPs that come up in the list.
Many of these are NOTHING to do with Cambridge University, and I think
they are in the list by error. Perhaps they appeared because some users
who were forwarding between different mailhosts configured their
mailhosts in the wrong order.
To be specific, the list of hosts/domains include the following:
*.bham.ac.uk (Birmingham University)
*.imperial.ac.uk (Imperial College, University of London)
*.dur.ac.uk (Durham University)
*.ic.ac.uk (Imperial College, University of London)
*.york.ac.uk (University of York)
*.community.net.uk
ocms.ac.uk (Oxford Centre for Mission Studies)
*.brad.ac.uk (Bradford University)
ac.uk
I believe that all of these should be removed.
Also, I the Mailhost is given the name by the system of "OCMS", which
matches a domain in the above list, and perhaps indicates that someone
at the Oxford Centre for Mission Studies was the first to add the
cam.ac.uk domain but registered his mailhosts in the wrong order.
Cheers.