Glossary
Related glossary terms
Email authentication protocols are standards that verify whether an email was actually sent by the domain it claims to come from. These protocols help prevent spoofing, phishing, and unauthorized sending, and are essential for establishing trust with inbox service providers (ISPs).
The three main protocols are:
Why it matters:
Without proper authentication, your messages are more likely to be rejected, sent to spam, or flagged as suspicious, no matter how clean your content is.
Note: Authentication isn’t optional anymore. Major mailbox providers like Gmail and Microsoft increasingly require alignment with SPF, DKIM, and DMARC for consistent inbox placement.
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