Also known as: Domain-based Message Authentication, Reporting & Conformance
A policy standard that builds on SPF and DKIM to tell receivers what to do with mail that fails authentication.
DMARC ties SPF and DKIM together and adds two things: alignment (the authenticated domain must match the visible "From" address) and a policy telling receivers what to do with mail that fails — do nothing, quarantine it to spam, or reject it outright.
DMARC also provides reporting: receivers send back aggregate reports showing who is sending mail using your domain, which surfaces both configuration problems and outright spoofing attempts against your brand.
Major mailbox providers now effectively require DMARC for bulk senders. A published DMARC policy, with aligned SPF and DKIM, is a baseline expectation for reaching the inbox at scale.
An email-authentication standard that lets a domain list which servers are allowed to send mail on its behalf.
An email-authentication standard that adds a cryptographic signature proving a message was not altered in transit.
The ability of your email to actually reach recipients' inboxes rather than being blocked or filtered to spam.
See it in action
Check any address against BounceShift's multi-layer engine — syntax, MX, disposable, and role checks free, with full SMTP verification on signup.