Gmail has a forwarding option. Can you make it forward only emails after its spam filter and not every email?
█ ► YOU CAN USE FILTER TO FORWARD ONLY THE MAIL WHICH MEAT YOUR CONDITION.
█ ► I AM USING THIS FEATURE AND GETTING MY REQUIRED RESULT.
G Mail have a really great option of forward Filter.
▬♂ http://mail.google.com/mail/help/about.html
You have to put you own filter for forwarding. so you can simply make your own spam gaurd.
you can have forward function applied only when your certain condition meets.
█ ►How do I set up filters?
You can create up to 20 filters to manage the flow of incoming messages. Use filters so that certain messages bypass the inbox, are automatically labeled, or both. You can also automatically forward messages to another email address using filters. Filtered messages remain archived and searchable.
To set up a filter, click 'Create a filter' to the right of the 'Search the Web' button. Next, enter your filter criteria in the appropriate fields. When you click Create Filter, a list of messages that match your filter appears.
After you create a filter, the filter rules are applied automatically to new messages in your inbox. You can change your filters at any time by clicking 'Settings.'
█ ►To edit filters:
Click 'Settings' at the top of any Gmail page.
Click 'Filters' along the top of the orange 'Mail Settings' box.
Click 'edit' next to the filter you'd like to update.
Enter the new criteria for the filter in the appropriate fields, and click 'Next Step.'
Choose an action for the messages to take, and click 'Update Filter.'
Please note that, at this time, it isn't possible to apply filters to mail you've already received.
However here procedure to get rid of spam
To remove spam from your inbox, check the box next to the unwanted message, and click Report Spam. If you discover a message is spam once you have opened it, just click 'Report Spam' along the top of the message to send it to the Gmail Team.
The more spam you mark, the better our system will get at weeding out those annoying messages. If you or we should happen to goof and mark a good message as spam, click Not Spam at the top of the message.
█ ►If you need more help you can contact me any time.