How to count the number of sent emails by user for a period?

Hi all!

I suspect a user to use my miab server to send mailing. I looking for the way with command line or anythink to have log show me the number of sent email by mailbox /period ?

Like the usual usage report email but by a period

Many thank for your help

Best,

Sofiane

There is a basic enough graphed list of postfix in Munin.

https://YOUR-SERVER/admin/munin/postfix-day.html

If your looking for a specific user you could grep though the logs.
as ROOT

 grep emailaddress@yourdomain /var/log/mail.log

where emailaddress@yourdomain is a valid email address.