Spam Mail workaround (abuse, postamser etc)

From company (A) I got box (B).

I intend to register resellers (C).
Each reseller can register his own customers (D).

Customers can spamming.
Spam can be putted to stop-list engines (spamcop etc.).
Engines can send complains to ...

So my questions:
What I need to setup on my box (B) to recieve complains and make proper actions.
Maybe also my resellers (C) can setup by their own something to cacth complains?

Please, advice...

 

 

 

 

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