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.