This may qualify as a Dumb Answer, but:
Could it be that you are subscribed under both mbglx@s-crim1.dl.ac.uk and
mbglx@seqnet.dl.ac.uk, and one account is forwarding to the other? I just
had that happen to a user on one of my systems...
For what it's worth, I am only getting one of each posting.
Raymond McCauley
Texas A&M University
scooter@tamu.edu