pop3 Log file?

[Marco Benetton]

Hi, 
I haven't a file where there are the pop3 log.
This is the configuration in the /etc/inetd.conf file


pop-3   stream  tcp     nowait  root    /var/qmail/bin/qmail-popup
qmail-popup dns.protec.it /bin/checkpassword /var/qmail/bin/qmail-pop3d
Maildir

Any suggestion?
Thanks

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Marco