Email deliverability
High-level steps to publish Google’s SPF include and DKIM keys for your primary domain.
Google publishes guidance for the correct SPF include directive for Gmail routing. Combine only with other authorized senders in a single SPF TXT record.
Enable DKIM in the Google Admin console and add the suggested DNS TXT records at the hostnames Google provides (selector-based _domainkey names).
Use Google’s domain verification tools inside Admin and external MX/DNS checkers that query live DNS—avoid guessing TXT values.
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.
Enable DKIM for Microsoft 365 custom domains and publish CNAME records as instructed.
What Sender Policy Framework does, how SPF TXT records work, and common mistakes.
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