how to check if your mail server on the spam black list

http://spamlinks.net/filter-dnsbl-lookup.htm#general-sites


http://www.emailtools.co.uk/tips/blacklists.htm


Check email black list tool
http://www.emailtools.co.uk/tools/blacklistcheck.htm
http://openrbl.org/query?i=xxx.xxx.xx.xxx
http://dnsbl.njabl.org/cgi-bin/lookup.cgi?query=xxx.xxx.xxx.xxx
http://www.junkemailfilter.com
http://www.mxtoolbox.com/blacklists.aspx


Check exchange server smtp log:
http://www.msexchange.org/tutorials/Logging_the_SMTP_Service.html

Stop Spam From the Inside by Locking Down SMTP:
http://technet.microsoft.com/en-au/magazine/cc161029.aspx