DNS for Email: The Records, TTLs, and Chains That Break Mail
Email is a DNS application. The full record inventory a sending domain needs, the TTL strategy for safe changes, and the misconfigurations that quietly break delivery.
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Email is a DNS application. The full record inventory a sending domain needs, the TTL strategy for safe changes, and the misconfigurations that quietly break delivery.
Every include, a, mx, and redirect in your SPF record costs a DNS lookup, and the budget is ten. Why records break at scale and how to fix them without flattening regret.