Original Author: Robert Mitchell - Posted June 8th 2015

As a follow-up to our communication regarding the addition of a new subnet on December 20, 2014, we are ready to begin leveraging our new /22 subnet. We will be adding into production customer delivery mail flow and LDAP queries on June 30, 2015.

Obtaining our own IP space gives us much better geographic portability and an ability to cycle a much greater number of IP addresses in order to avoid blacklisting. These are very significant benefits for all of our partners and your clients.

Our new subnet is:

If you have not configured access control or a firewall rule to prevent incoming SMTP connections from non-Reflexion subnets, or if you use Hosted Exchange or Google Apps, you do not need to make this change. However, these configurations are HIGHLY recommended. The MX records and smart host will remain the same.

Please implement these changes before June 30, 2015, as we will begin using the IP addresses on July 1, 2015. Please visit our knowledgebase athttp://tickets.reflexion.net/index.php?/Knowledgebase/List for detailed instructions on how to make these changes.

Customer firewalls and Exchange access control should now have the following subnets:

Subnets for SMTP on port 25, 2525, 587: ( (

For Office 365 you will need to enter the following: ( ( ( ( (

Subnets for LDAP on port 389 and 636: ( (

SPF (TXT) Record:

v=spf1 mx include:reflexion.net ~all