The original message was received at Sun, 2 Sep 2012 06:35:08 -0700 from [159.0.177.1] ----- The following addresses had permanent fatal errors ----- clm@bellsouth.net (reason: 550-216.231.224.203 blocked by ldap:ou=rblmx,dc=att,dc=net) (expanded from: <03fc37a4b@championlincoln.com>) ----- Transcript of session follows ----- ... while talking to gateway-f1.isp.att.net.: <<< 550-216.231.224.203 blocked by ldap:ou=rblmx,dc=att,dc=net <<< 550 Error - Blocked for abuse. See http://att.net/blocks ... while talking to gateway-f2.isp.att.net.: >>> QUIT <<< 550-216.231.224.203 blocked by ldap:ou=rblmx,dc=att,dc=net <<< 550 Error - Blocked for abuse. See http://att.net/blocks 554 5.0.0 Service unavailable
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DNSBL* - is a list of IP addresses published through the Internet Domain Name Service (DNS) either as a zone file that can be used by DNS server software, or as a live DNS zone that can be queried in real-time. DNSBLs are most often used to publish the addresses of computers or networks linked to spamming; most mail server software can be configured to reject or flag messages which have been sent from a site listed on one or more such lists.
WHOIS** - is a query/response protocol that is widely used for querying databases in order to determine the registrant or assignee of Internet resources, such as a domain name, an IP address block, or an autonomous system number. WHOIS lookups were traditionally performed with a command line interface application, and network administrators predominantly still use this method, but many simplified web-based tools exist. WHOIS services are typically communicated using the Transmission Control Protocol (TCP). Servers listen to requests on the well-known port number 43.
** Approximate Geographic Location - This is NOT the exact geographical location of the person/organization with the given IP address. However, this should still give you a good idea about the area/region where this person/orgranization is located.