Definition
Third-party sends can break SPF if not authorised. Delegation via DKIM and DMARC alignment solves this.
Best Practices
- Authorise third-party senders in your DNS.
- Use DKIM signatures from the third party.
- Confirm DMARC alignment for delegated sends.
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Related Glossary Terms
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Email Authentication Protocols
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Frequently Asked Questions
A service or partner sending mail for your domain.
Their IPs are not in your SPF record.
Use DKIM and aligned sending, or add their IPs to SPF.