Mail exchanger (MX) record setup with Email Security.cloud

Products

• Email Security.cloud

Issue/Introduction

 You want to set up your Mail Exchanger (MX) records for inbound mail with Email Security.Cloud.

To ensure that all of your email is scanned, you need to configure your organization's MX records correctly. First, you need to identify who hosts your domain/s. You can use a third-party provider to check who your DNS provider is.

Each provider supplies an online form to make any changes. The changes that you need to make are outlined in the Solution section below.

A set of MX records may look like the following:

example.org    MX preference = 10, mail exchanger = mail.example.org
example.org    MX preference = 20, mail exchanger = relay.example.org

Environment

Email Security.cloud

Resolution

In order to have your organization's email traffic scanned by the Email Security.cloud services, you need to ensure that all your emails are directed to our scanning servers. There are both primary and secondary records to be configured and they must be prioritized properly to ensure consistent mail flow. The proper format and hierarchy is outlined below: 

example.org     MX preference = 10, mail exchanger = clusterX.XX.messagelabs.com
example.org     MX preference = 20, mail exchanger = clusterXa.XX.messagelabs.com

Note : The first X represents the Cluster number you are provisioned on and the XX represents the Region. You must not include your own Mailhost (mailhost.example.org in this example) anywhere in the MX records. If it remains, some email may be delivered directly to your mail server and therefore, they may not be scanned.

For MX records: the higher the number, the lower the priority. 

Most DNS changes take up to 24 hours to be propagated.