DNS Black List

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Email Blacklist Check - See if your server is blacklisted

Open Relay Test

SORBS (Spam and Open-Relay Blocking System)

Skip over navigation The DNSBLs on this page are either confirmed dead or presumed dead - you should no longer be using them. Check the list of DNSBLs you have carefully against this list.

http://spamlinks.net/filter-dnsbl-dead.htm

DNS Black List

Email Blacklist Check - See if your server is blacklisted

Open Relay Test

SORBS (Spam and Open-Relay Blocking System)

Spam Links - dead dnsbls and rhsbls

njabl.org

The CBL

SpamCop.net - Beware of cheap imitations

The Spamhaus Project