Stopping SPAM at the source - the server. Input anyone?

Is there a feasable way to detect and stop spam being sent from your servers by a ligitimate-appearing client?

I had thought to limit accounts to a certain number of emails per day, after which number the account is flagged for review, but I have heard that there are CGI and ASP.NET scripts that use a direct send system (such as AspNetEmail). Is there a safe way to block this type of activity on an account by account level?

Would not want to block legitimate companies (that I have verified) from sending as many emails as they want, but I do not want a unverified customer sending a few hundred thousand emails when my back is turned.

Any input appreciated!


Dave

 

 

 

 

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