What is Email Authentication?
Quick Answer
Technical protocols (DKIM, SPF, DMARC, BIMI) that verify an email's sender identity to prevent spoofing and phishing.
Email authentication is a set of techniques that verify emails are genuinely sent by the domain they claim to be from. The three main protocols are SPF (sender IP authorization), DKIM (cryptographic signature), and DMARC (policy enforcement). BIMI (Brand Indicators for Message Identification) extends this to display your logo in the inbox. Gmail requires both SPF and DKIM for bulk senders as of 2024. MisarMail configures all authentication protocols automatically.
Related Terms
An email authentication protocol that lets receiving servers verify that an email was sent by the domain it claims to be from.
SPF (Sender Policy Framework)A DNS record that specifies which mail servers are authorized to send email on behalf of your domain.
DMARC (Domain-based Message Authentication)An email authentication policy that tells receiving servers what to do with emails that fail DKIM or SPF checks.
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