Post Fix - SMTP

I am planning to use Postfix as my SMTP server for relaying bulk e-mails.
Since it is a free software I would like to know what is the best Anti SPAM solution I can use along with Postfix.
I am O.K to use any commercial/paid software & also any free software which can be used along with Postfix to filter SPAM & Virus in the mail.
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SrikantRajeevAuthor Commented:
I have used this. But not that efficient.
Ok, check this. I've seen good reviews about this and it is free.

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