> On Sun, 2005-08-28 at 11:01, Preston Crawford wrote: > If you were running your own MTA I would recommend you implement > greylisting. This would eliminate >98% of spam with little or nor > impact to your MTA servers resources. On my CentOS 3.5 sendmail server I simply added: FEATURE(`blacklist_recipients')dnl dnl # dnl # dnsbl - DNS based Blackhole List/Black List/Rejection list dnl # See http://www.sendmail.org/m4/features.html#dnsbl dnl # FEATURE(`dnsbl', `bl.spamcop.net', `"Spam blocked see: http://spamcop.net/bl.shtml?"$&{client_addr}')dnl FEATURE(`dnsbl', `relays.ordb.org', `"Spam blocked see: http://ordb.org/lookup/?host="$&{client_addr}')dnl FEATURE(`dnsbl', `cbl.abuseat.org', `"Spam blocked see: http://cbl.abuseat.org/lookup.cgi?ip="$&{client_addr}')dnl FEATURE(`dnsbl', `sbl.spamhaus.org', `"Spam blocked see: http://spamhaus.org/query/bl?ip="$&{client_addr}')dnl FEATURE(`dnsbl', `list.dsbl.org', `"Spam blocked see: http://dsbl.org/listing?"$&{client_addr}')dnl to my sendmail.mc file. I'm sure it will work in CentOS 4. I forget where I found the instructions for blacklisting. This has dramatically reduced the spam on my server. Kirk Bocek