SUMMARY part 2: /usr slowly fills

Further thanks to Orjan Petersson, Oisin McGuinness and Joe Fletcher.

/usr/var/spool/mqueue suddenly increasing in size could have 
indicated a spam relay in action, but the mail log show the following 
error repeatedly occurring:


Mar  6 11:50:00 yoda sendmail[11087]: k26Bo050000011087: from=root, 
size=53, cla
ss=0, nrcpts=1, 
msgid=<[email protected]>, relay
=root@localhost
Mar  6 11:50:00 yoda sendmail[2718]: k26Bo0R0000002718: SYSERR(root): 
Cannot bin
d to map mail.aliases in domain mrc: no such map in server's domain: 
No such fil
e or directory

which is caused by an error in the NIS config.

Thanks again for all replies.
Derek