[gentoo-user] Cryptic error from some cron job

[Mick]

Hi All,

I have rebuilt a PC which has started sending me this error whenever it runs 
logrotate:
========================================================
Password: 501 Not authorised --- Reply not authenticated
error: stat of /var/log/cups/access_log failed: No such file or directory
error: stat of /var/log/cups/error_log failed: No such file or directory
error: stat of /var/log/cups/page_log failed: No such file or directory
========================================================

Would you know what might be causing the above 501 error?

PS. I use ssmtp to send mail of the logs with the same settings from different 
PCs and I have not noticed this error before on this or any other machine.
-- 
Regards,
Mick