What is the script that CWP uses to rotate the postfix mail log ?

I note that the Postfix mail log is 'rotated' on an intermittent basis - the file var/log/maillog is renamed to include a date based suffix and a new file var/log/maillog is created, but I want to be able to do this more frequently.

A Google search revealed that

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# logrotate -f /etc/logrotate.d/syslog will reset the maillog (plus others), but I've found that the maillog is renamed maillog.1 and then deleted.

Does anyone know what script CWP uses to rotate the log ?

it can only default in the logrotate, nothing other exist in cwp.