Automatically notifying ISP of spam?

I was thinking of modifying our MailScanner installations on our email servers to automatically notify the abuse contact of the IP block for spam that are received.

Do you think this is a good idea? The only problem that I can think of is, many many spams come from the same IP range, so it may automatically send hundreds of emails to an ISP... but I can rate limit it to 1 time per class C - sound good?

Thanks.

 

 

 

 

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