postfix/postdrop warning in logs
On some 10.6.8 client Macs I'm seeing these entries in the system logs. These are just basic client Macs and shouldn't be doing anything mail related other than basic email via MS Outlook 2011.
10/25/11 9:51:06 AM com.apple.launchd[1] (org.postfix.master) Failed to count the number of files in "/var/spool/postfix/maildrop": No such file or directory
10/25/11 9:51:11 AM postfix/master[89381] daemon started -- version 2.5.5, configuration /etc/postfix
10/25/11 9:51:11 AM postfix/pickup[89382] 63DAC308062D: uid=0 from=<root>
10/25/11 9:51:11 AM postfix/cleanup[89384] 63DAC308062D: message-id=<20111025165111.63DAC308062D@uds.example.edu>
10/25/11 9:51:11 AM postfix/qmgr[89383] 63DAC308062D: from=<root@uds.example.edu>, size=6156, nrcpt=1 (queue active)
10/25/11 9:51:11 AM postfix/local[89386] 63DAC308062D: to=<root@uds.example.edu>, orig_to=<root>, relay=local, delay=288469, delays=288469/0.06/0/0.02, dsn=2.0.0, status=sent (delivered to file: /dev/null)
10/25/11 9:51:11 AM postfix/qmgr[89383] 63DAC308062D: removed
and this in the mail.log file:
Oct 25 09:51:03 udp015338uds postfix/postdrop[34961]: warning: mail_queue_enter: create file maildrop/812308.34961: No such file or directory
Oct 25 09:51:03 udp015338uds postfix/postdrop[71803]: warning: mail_queue_enter: create file maildrop/812413.71803: No such file or directory
Oct 25 09:51:11 udp015338uds postfix/master[89381]: daemon started -- version 2.5.5, configuration /etc/postfix
Oct 25 09:51:11 udp015338uds postfix/pickup[89382]: 63DAC308062D: uid=0 from=<root>
Oct 25 09:51:11 udp015338uds postfix/cleanup[89384]: 63DAC308062D: message-id=<20111025165111.63DAC308062D@uds.example.edu>
Oct 25 09:51:11 udp015338uds postfix/qmgr[89383]: 63DAC308062D: from=<root@uds.example.edu>, size=6156, nrcpt=1 (queue active)
Oct 25 09:51:11 udp015338uds postfix/local[89386]: 63DAC308062D: to=<root@uds.example.edu>, orig_to=<root>, relay=local, delay=288469, delays=288469/0.06/0/0.02, dsn=2.0.0, status=sent (delivered to file: /dev/null)
Oct 25 09:51:11 udp015338uds postfix/qmgr[89383]: 63DAC308062D: removed
What is likely the cause? How can I fix/stop it?
These Macs have ssh locked down with hosts.allow and sshd_config configured to only only certain subnets and users so I don't think they've compromised via ssh.
Thanks
iMac, Mac OS X (10.6.8)