Sendmail and DNSBL

[gbburkhardt at aaahawk.com (Glenn Burkhardt)]

Scan your '/var/log/mail/info' file (or wherever the mail logs go - check 
/etc/syslog.conf for a line like:

# Mail logging
mail.=debug;mail.=info;mail.=notice               -/var/log/mail/info

You might need to make sure that mail.debug gets logged.

Then simply search for 'reject'. 

See the section entitled "Testing your SBL Setup" at

http://www.spamhaus.org/sbl/howtouse.html

but that only works if spamhaus.org is one of your DNSBL entries.