Spam Post Defense / ID spam form posts

Can server1 receive a web page form post from remoteAttacker,
identify it as spam (or a DoS or DDoS attack),
hand off the socket to multiple threads on multiple servers owned by
server1's owner,
return multiple responses to remoteAttacker which normally would have been a
single response returned by server1,
so that server1 is not busy responding to remoteAttacker and is able to
handle legitimate requests?

Technically?
Legally?

The boss doesn't want to use a CAPTCHA on the form but wants us to identify
it without additional user input.

Also, can a form post be run through an email spam filter to identify it as
spam?

Do you have any ideas to detect spam form posts?
I'm tracking the spam posts in an attempt to find a pattern I can use to
detect them.

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RE: Spam Post Defense / ID spam form posts

Sorry, wrong list (although I'm tracking them in a DB).

Advice appreciated...

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