[KLUG Members] sendmail blocking spam with dnsbl?

[Bruce Smith]

> How can I tell if sendmail is blocking spam like I expected?
> 
> I applied the block as it appears here:
> 
> http://spamcop.net/fom-serve/cache/294.html
> 
> Specifically, I applied the first one, dnsbl, because the second one, enhdnsbl,
> wouldn't compile.
> 
> But am still receiving spam.  How can I tell if it is working or not?  Is there
> a log file somewhere that indicates when spam is being blocked?

You should have log entries for every message that is blocked in
/var/log/maillog    This is one example from my log file:

Jan 14 11:28:53 mail sendmail[26782]: h0EGSq126782: ruleset=check_relay,
arg1=[216.9.66.141], arg2=216.9.66.141, relay=[216.9.66.141], reject=553
5.3.0 Spam blocked see:http://spamcop.net/bl.shtml? 216.9.66.141

BTW, in the last four weeks, spamcop's DNSBL has blocked between
2000-3000 spams PER WEEK on my employer's sendmail server.  And we're a
small company!  The high was four weeks ago, where it blocked 3065 spams
in ONE WEEK.

--------------------------------------------
Bruce Smith                bruce@armintl.com
System Administrator / Network Administrator
Armstrong International, Inc.
Three Rivers, Michigan  49093  USA
http://www.armstrong-intl.com/
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