Email deliverability
Enable DKIM for Microsoft 365 custom domains and publish CNAME records as instructed.
In the Microsoft Defender portal or classic Exchange admin experiences, register the domain for DKIM and note the CNAME targets Microsoft provides.
Create the exact hostnames and targets Microsoft lists—typos here break verification.
Send messages through Microsoft 365 and inspect authentication headers on received copies from a mailbox that shows full headers.
DomainKeys Identified Mail: cryptographic signatures, selectors, and DNS TXT publishing.
DMARC builds on SPF and DKIM, adds alignment rules, and enables aggregate and forensic reporting.
High-level steps to publish Google’s SPF include and DKIM keys for your primary domain.
What Sender Policy Framework does, how SPF TXT records work, and common mistakes.
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