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Split-brain DNS Pitfalls

The "internal" vs. "external" map. Split-brain" DNS is when you show one set of DNS records to your internal network (your company) and a different set to the public internet. This section explains how this common setup can break authentication if not configured perfectly.

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Questions about Split-brain DNS Pitfalls

What is split-brain (or split-horizon) DNS? How can split-brain DNS cause email delivery problems? How can I ensure my internal and external DNS views are consistent for email?