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Since you have no control over the box sending mail to you, it cannot be done. You have to filter the mail instead. I would guess you could have your router drop all packets that come from the IP address of the offending box.
Send e-mail to the owner of the box, too. Encourage them to change their ways.
i don't know how to do it right now, but i am 100% sure iptables can do the connection limiting thing... perhaps someone will post a link or something...
but this does sound like something an anti-denial of service for mail server tools would do... i mean there has to be someone out there that made a script or something to keep one's mail server form getting bombed.