Open Source Intelligence (OSINT): DNS records are designed to be public knowledge, enabling anyone to send an email to a domain.This is a very invasive and disruptive approach to deploying a security solution. Complexity and Disruption: An MX record approach to email routing requires reconfiguration of an organization’s DNS records and makes significant changes to email routes.This enables emails to be routed through the gateway but has significant downsides, including: When deploying a legacy SEG, an organization must change its MX records to point to the IP address of that gateway. The purpose of the MX record is to identify the IP address of the domain’s email server or mail transfer agent, enabling inbound emails to be routed to that server.
An MX record is part of the DNS record associated with a particular domain.
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