There are a couple of ways, but none that give you a simple number.

Use an archive search with date range

S * IN listname FROM yyyy/mm/dd TO yyyy/mm/dd

or

Subscribe in INDEX mode and start accumulating the beginning sequence numbers returned.

At 03:30 02/14/2000 Monday , Admin wrote:
>Is there a way to track how many messages are sent to a given list
>within a given period of time?  What about tracking how many messages
>are sent to every list on a given server within a specific time frame?
>
>Sherry