Email authentication tells mailbox providers whether a message is allowed to use your domain. SamuelGuard checks the records and received-message evidence, then explains what needs attention.
SPF lists the mail servers and services allowed to send for a domain. If your email platform is missing from SPF, the message can look unauthorised.
DKIM adds a cryptographic signature to the message. It helps prove that the email was not changed in transit and that the sending service has permission to sign for the domain.
DMARC tells receivers what to do when SPF or DKIM do not align with the visible From domain. Even a simple DMARC record is better than none.
DNS records matter, but a real email shows what actually happened. SamuelGuard checks both setup and message evidence where available.
DMARC is increasingly expected for legitimate senders. It is especially important when sending from branded business domains.
No. Authentication is the foundation, but content, reputation, engagement, and sending behaviour still matter.
SamuelGuard gives you a spam risk score, delivery health, authentication checks, blacklist checks, content warnings, and practical fixes you can act on before the next send.