It was as easy and trivial as I had suspected, but it is comforting to have
confirmation *before* messing about with something as critical as a mail
server!
I used the first option suggested, which was the word 'single' appended to the
MILO boot command line - this worked fine.
Thanks once again
John Armstrong Computer System Adminstrator
john@lrf.leeds.ac.uk LRF Centre at Leeds University
17 Springfield Mount
Leeds LS2 9NG
0113 233 3912 (phone)
0113 242 6065 (fax)