As a further effort to reduce spam, I decided to link up my sendmail.cf with the Realtime Blocking List (RBL) of spamcop.net. This requires adding "FEATURE(`dnsbl', `bl.spamcop.net', `"Spam blocked see: http://spamcop.net')dnl" in sendmail.mc and then using m4 to recompile sendmail.mc to sendmail.cf.The blocking capability of spamcop RBL is astonishing. Within the first day, the RBL successfully rejected over 100 junk email from suspected spam sites. The amount of spam delivered to my mail server is reduced by over 60 %.
I note that major ISPs and big companies are also using the Spamcop RBL. Wooo... Spamcop has done a great work to the Internet world.
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