Sometimes (and I don't see any dependencies) the tmail program writes the error message "unable to lock append mailbox".
The most likely cause is that either the /tmp directory is protected other than 1777, or that the lock file protection was changed from the (correct) 0666 to something else.
-- Mark --
http://staff.washington.edu/mrc Science does not emerge from voting, party politics, or public debate. Si vis pacem, para bellum.
