Mario:
Can anoyone tell me why this command is not executed (or it is without success) from crontab, but works perfectly from the command line ? (yes, i've restarted crontab service)
# clean up postmaster 00 30 * * * root /usr/bin/find /var/qmail/maildirs/ postmaster@telbit.pt/Maildir/new -type f -print0 | xargs -0 -n 50 rm
If that is the actual crontab entry, then it is not valid, as the second column is the hour (there is no hour 30). You probably want this:
30 00 * * * root /usr/bin/find /var/qmail/maildirs/ postmaster@telbit.pt/Maildir/new -type f -print0 | xargs -0 -n 50 rm
Alfred