Subdomains

Delegated hostnames that inherit or override authentication policy.

Reading time:: 5 min
Difficulty:: Intermediate
Estimated duration:: 5 min
Prerequisites:: None
Last updated:: 2026-07-15
Author:: empire

Definition

Delegated hostnames that inherit or override authentication policy.

How it works

Subdomains inherit some organizational policy context (notably DMARC) while allowing separate MX, SPF, and sending identities for transactional versus marketing streams.

DNSDomain Name System — the lookup fabric email authentication depends on.

Subdomains

Definition

How it works

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Subdomains

Definition

How it works

▼Continue Learning