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  1. Thank you. That list is a copy of my tcp.smtp.cdb which is used before hitting SC, the CBL-XBL and SORBS (in that order). You can see the effect of that blocking at http://scasey.com/support/mailstats.htm That list was build by capturing mail sent to invalid addresses on my server and then 1) parsing out the delivering server IP address 2) looking up that IP address in whois 3) and blocking the entire netblock that address lives in I only block mail from (some) foreign countries. The entire process is outlined at http://scasey.com/support/mail_process.htm The process is entirely automated using a perl program I wrote. The program calls The CyberAbuse Whois by Philippe Bourcier and parses the result to determine the sending country to enter into the cdb. Feel free to copy the list if you find it useful. Sean Casey
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