The only thing you can do is filter those emails straight to the trash. It'll take a while for you to filter the most common spam senders. An alternative is to disable email sync and check email when you are on WiFi.
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Go to your Google Mail account on your PC and go through the spam you've received and mark it as spam.
This will help speed up the process.
The bulk of the filtering and spam removal will then occur before it's sent to your phone.
No spam filter will catch all the spam, I still get 2-3 a week on the phone, but the online spam folder gets hundreds.
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