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Try User-level email routing options
There is SpamFence. SpamFence offers professional e-mail security with spam filter and e-mail categorization service and it's free for private use. How does SpamFence work?
This isn't a definitive answer because it may not be 100% accurate... but, no. It looks like Google has married the two services so it isn't possible to use one without the other
If you are a paying customer, you can call them and ask them directly.
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