RCPT from opt.fernworks.net[96.57.53.174]. According to our firewalls and mail servers, this address attempted to send SPAM to user "snccz" every 10 minutes over the space of a day, no such user exists on our network and never has. The address resolves to both ns5.fernworks.net and opt.fernworks.net. These do not match the FQDN sent to our servers in the HELO (helo=<set.fernworks.net>) so all attempts were rejected with the error "Recipient address rejected: unverified address:".
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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.