A CAPTCHA (an acronym for "Completely Automated Public Turing test to tell Computers and Humans...Email Harvesting
What is Email Harvesting: Email harvesting is the process of obtaining a large number of...FQDN
A fully qualified domain name consists of a host and domain name, including top-level domain. For...PTR Record
PTR (pointer) Creates a pointer that maps an IP address to a host name for reverse lookups.