To Filter By Source - Use Advanced Settings in your Dashboard

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How Advanced Trap Settings work?

The Left hand columns contain your Publisher Ids along with the clicks generated from each of these Ids.

And the top column lists all the Traps, grouped based on their type.

All you need to do now is click on the boxes to enable the traps against each publisher who is generating traffic that doesn't match you demand.

For Example: If Publisher A is generating 30% of the total clicks from Botnets. You have to enable the Botnet trap for Publisher A to block those