Open Mail Relays

Overview

This has to do with misconfigurations in a mail server that would allow us to perform a mail relays. It is more common to find "Partially Open Mail Relays" out there which can be used send an email from an external source address to an internal destination address or send an email from an internal source address to an internal destination address.

This can lead to phishing and scamming by using an internal email using their domain.

Example

How to Test for Open Mail Relays - Black Hills Information SecurityBlack Hills Information Security

How to perform and explanations