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Internal networks

As stated above, there is usually no need to configure MX Records for internal use, simply because internal (i.e. inter-organization) e-mail and replication traffic is usually controlled via Active Directory-store information. However there are some cases where you will want to configure internal MX Records.

While these MX Records will generally not cause any harm even if you configure them without actually needing them, you must pay close attention to various configuration issues, especially when Mail-Relays and Smart-Hosts are involved. Therefore I cannot say for sure if configuring non-necessary MX Records will cause any problems to your local network. If you do not know for sure (and this might be the case since you've bothered to read this article in the first place) I suggest you consult a network specialist before doing any changes.

Fault Tolerance

In case your mail server fails you'd like to still be able to receive incoming e-mail messages. Most small to medium sized companies will pay their ISPs some monthly fee and that will buy them storage space on the ISPs mail servers. For that to happen, a new MX Record will be added to their DNS information, pointing to the ISPs mail server with a higher priority. For example:

Record FQDN

Record Type

Record Value

MX Pref

mail.dpetri.net

A

192.90.1.17

 

mail.isp.com

A

212.143.25.1

 

dpetri.net

MX

mail.dpetri.net

10

dpetri.net

MX

mail.isp.com

100

 


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