Throttling/limiting SMTP - block spammers

Anyone have any tips on throttling/alerting to mass smtp sends from your servers? Anything built into sendmail i can tinker with?

We already do the relay checks and several others, but they don't do much to prevent anything internal to the server from going nuts.. had a user i just had to "fire" for running this script.

any suggestions?

 

 

 

 

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