Amount of email passing through Exchange 2003

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From: Blake (Blake_at_discussions.microsoft.com)
Date: 11/10/04 

Date: Wed, 10 Nov 2004 11:45:03 -0800

I would like to know the number of emails, as well as total megabytes, that
get sent out of and into our single server Exchange 2003 site.

How is that possible to find out?

Thanks!

Blake