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Email Marketing Glossary.

Clear, no-fluff definitions of every email marketing term that matters—from open rates to double opt-in. 

 

Email Authentication

Email authentication is a set of protocols — SPF, DKIM, and DMARC — that prove your emails genuinely come from your domain, protecting against spoofing and improving deliverability.

Also known as: domain authentication, sender authentication

Email authentication is how you prove to mailbox providers that you are who you say you are. Without it, spammers can impersonate your domain, and providers are far more likely to distrust your mail.

What are the main authentication protocols?

SPF specifies which servers may send for your domain, DKIM adds a cryptographic signature proving the message is genuine and untampered, and DMARC ties them together and sets a policy for failures.

Why does email authentication matter?

Google, Yahoo, and Microsoft now require authentication for bulk senders. Without it, your mail can be rejected or routed to spam regardless of content quality.

How do you set it up?

Publish SPF, DKIM, and DMARC records in your domain's DNS — often guided by your email platform or sending-domain setup. Verify all three pass before sending at scale.

Related terms

Email Deliverability Sender Reputation SPF DKIM DMARC Hard Bounce

Related reading from Drip

What is DMARC Security? (Help Center) What Do Google & Yahoo's New Sender Requirements Mean?

Frequently asked questions

What is email authentication?
Email authentication is a set of protocols — mainly SPF, DKIM, and DMARC — that prove your emails genuinely come from your domain. It protects against spoofing and is essential for good deliverability.
What are the main email authentication protocols?
SPF authorizes which servers can send for your domain, DKIM adds a cryptographic signature proving the message is authentic and unaltered, and DMARC ties SPF and DKIM together and sets a policy for handling failures.
Why is email authentication required?
Major mailbox providers like Google, Yahoo, and Microsoft now require authentication for bulk senders. Without it, your emails can be rejected or filtered to spam regardless of how good the content is.
How do I set up email authentication?
Publish SPF, DKIM, and DMARC records in your domain's DNS, typically following your email platform's sending-domain setup. Confirm all three pass authentication checks before sending at scale.
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