This is in response to the Fighting spam with Gmail post…
Kurt Wismer [anti-virus rants] has a point there. Check out his post on how NOT to fight spam with gmail.
Anyways, the filtering using (.) method can still be used to categorize your incoming mails 
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Please, can you PM me and tell me few more thinks about this, I am really fan of your blog…
You made some good points there. I did a search on the topic and found most people will agree with your blog.