Monthly Outbound Email Quantity

Hello, Is there an easy way to find out the number of emails relayed from a cPanel server to the outside world for a given month? It seems that 'View Mail Statistics Summary' only provides a couple of days of data. 'View Relayers' only goes back 10 days. I suppose I can use 'View Relayers' and multiple the total value by ~3, but I was wondering if there is a better and more definite method? Thanks!