DMARC
DMARC links a successful SPF or DKIM check to the visible sender domain. Policy and reports help with its technical oversight.
DMARC stands for Domain-based Message Authentication, Reporting and Conformance. A successful result requires a valid SPF or DKIM check with appropriate alignment to the domain in the visible From field. This relationship is called alignment. An arbitrary positive check result is not enough.
Include the external sending service
In the fictional design, a support portal sends message R-456 through a new service. The team checks which domain the service actually uses for SPF or DKIM and whether it aligns with the visible sender domain. The brand name in the displayed sender does not answer that question.
The planned test records the domains used and the associated result. This allows a later change to the sending route to be compared using the same test case, without claiming a delivery rate that was actually measured.
Distinguish policy from outcome
The domain can publish a DMARC policy and requested reporting destinations. Receivers consider these in their processing; this does not create a general acceptance guarantee. Even a successful result does not make the message content trustworthy or prove inbox placement. Authentication results and delivery observations therefore remain separate measures for your operations.
Sources
Related terms
- Sender Policy FrameworkSPF checks a sending server’s authorisation to use an SMTP domain. The visible sender line and receipt are separate questions.
- DomainKeys Identified MailDKIM links signed email components to a domain. A valid signature establishes neither encryption nor the person behind the message.
- Email deliverabilityDeliverability is about whether expected email actually reaches the inbox. Check sending status, authentication and actual receipt separately.
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