SPAMHAUS-ZENSpamhaus ZENSpamhaus ZEN is one of the most popular DNS blacklists, which is free for low-volume usage. To see if you qualify for free use, visit the link below: http://www.spamhaus.org/organization/dnsblusage.html Actions: DNS A RR 127.0.0.2, 127.0.0.3: Listed in SBL. DNS A RR 127.0.0.4, 127.0.0.5, 127.0.0.6, 127.0.0.7, 127.0.0.8: Listed in XBL. DNS A RR 127.0.0.10, 127.0.0.11: Listed in PBL. TXT example: "http://www.spamhaus.org/query/bl?ip= 127.0.0.2"zen.spamhaus.orgyesyeshttp://www.spamhaus.org/http://www.spamhaus.org/query/bl?ip={IP}AnoYesNo127.0.0.25505.2.1 Mailbox unavailable. Your IP address {IP} is blacklisted using {BLACKLISTNAME} (SBL section). Details: {TXTDATAORWEBLOOKUP}.YesNo127.0.0.35505.2.1 Mailbox unavailable. Your IP address {IP} is blacklisted using {BLACKLISTNAME} (SBL section). Details: {TXTDATAORWEBLOOKUP}.YesNo127.0.0.45505.2.1 Mailbox unavailable. Your IP address {IP} is blacklisted using {BLACKLISTNAME} (XBL section). Details: {TXTDATAORWEBLOOKUP}.YesNo127.0.0.55505.2.1 Mailbox unavailable. Your IP address {IP} is blacklisted using {BLACKLISTNAME} (XBL section). Details: {TXTDATAORWEBLOOKUP}.YesNo127.0.0.65505.2.1 Mailbox unavailable. Your IP address {IP} is blacklisted using {BLACKLISTNAME} (XBL section). Details: {TXTDATAORWEBLOOKUP}.YesNo127.0.0.75505.2.1 Mailbox unavailable. Your IP address {IP} is blacklisted using {BLACKLISTNAME} (XBL section). Details: {TXTDATAORWEBLOOKUP}.YesNo127.0.0.85505.2.1 Mailbox unavailable. Your IP address {IP} is blacklisted using {BLACKLISTNAME} (XBL section). Details: {TXTDATAORWEBLOOKUP}.YesYes127.0.0.105505.2.1 Mailbox unavailable. Your IP address {IP} is blacklisted using {BLACKLISTNAME} (PBL section). Details: {TXTDATAORWEBLOOKUP}.YesYes127.0.0.115505.2.1 Mailbox unavailable. Your IP address {IP} is blacklisted using {BLACKLISTNAME} (PBL section). Details: {TXTDATAORWEBLOOKUP}.YesNo5505.2.1 Mailbox unavailable. Your IP address {IP} is blacklisted using {BLACKLISTNAME}. Details: {TXTDATAORWEBLOOKUP}.