Dear All Egypt Engineers,
I collect some URL’s which you can use to check if your Exchange server is blacklisted or not.

http://www.spamcop.net
http://www.us.sorbs.net/lookup.shtml
http://dnsbl.njabl.org/lookup.html
http://cbl.abuseat.org/lookup.cgi
http://www.spamhaus.org/sbl/
http://www.mxtoolbox.com/blacklists.aspx

There are many more URL’s but these are most known for administrators.
Hope these URL’s are useful for you!
Mohamed Fouad