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Best way to stress test a new Postfix server?

From: Bryan K. Walton (bryankwaltonmachlink.com)
Date: Tue Jan 03 2006 - 14:09:38 CST

Hi,
        I've built a new Postfix SMTP server for an ISP. We would
like to stress test it by hitting it pretty hard with email, both
legitimate and also spam. Can anybody recommend the ideal way to do
this? I searched online for SMTP traffic generators, and I know that
Postfix has a smtp-source program. But ideally, I'd like something
that can pull from a body of mail (perhaps mbox files) and throw that
mail at the new server, to see how it handles the load. Any advice?
        BTW, the server is running on Solaris 8.

Thanks!
Bryan Walton