Patent ID: 8914883
Filing Date: 2014-12-16
Classification: G06F,H04L

Abstract:
1. A method for securing electronic mail (email) communications comprising: receiving, by a network device, an outbound email originated by a computing device of an internal network and directed to a target recipient; evaluating, by the network device, whether a domain name of the target recipient is present in a local white list or a local black list; when the domain name is determined to be present in the local white list, transmitting the email to the target recipient; when the domain name is determined to be present in the local black list, preventing transmission of the email to the target recipient; when the domain name is determined not to be present in one of the local black list and the local whitelist, determining, by the network device, whether the domain name is present in a global doppelganger database; when the domain name is determined to be present in the global doppelganger database, preventing transmission of the outbound email to the target recipient if the domain name is an unacceptable domain name and transmitting the outbound email to the target recipient if the domain name is an acceptable domain name; when the domain name is determined not to be present in one of the local black list and the local white list and the global doppelganger database, dynamically verifying, by the network device, validity of the domain name; and when the validity of the domain name is confirmed by said dynamically verifying, transmitting the outbound email to the target recipient and when the validity of the domain name is not confirmed by said dynamically verifying, preventing transmission of the outbound email to the target recipient.