Hi Tarun,
I would suggest that you check the following link:
http://www.howtodothings.com/computers/a871-how-to-use-dns-blocklists-to-detect-spam.html
Basically, you should get sender's IP from Received header, and check it against some of DNSBL providers.
Can you please check it out?
Regards,
Damba
Complete thread:
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