O Implement Multiple MX Servers

As you learned in "Email Routing," the design of the SMTP protocol takes into consideration the existence of multiple servers for each domain or subdomain by establishing multiple MX records in the DNS maps.

As in all redundant environments, a best practice is to have at least one secondary or tertiary MX server off-site in a remote location with a different ISP. In some cases, this can be achieved as part of an agreement with a secondary ISP or a "partner" organization, allowing you to receive email traffic and store it securely while your primary server becomes available.

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The Ultimate Computer Repair Guide

The Ultimate Computer Repair Guide

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