---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/sendgrid/glossary/email-authentication#article
headline: Email Authentication
description: "*Internet Security*. Technical standards to help ISPs and other receivers validate the identity of an email sender."
url: https://www.twilio.com/docs/sendgrid/glossary/email-authentication
inLanguage: en
dateModified: 2026-07-23T16:57:51.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# Email Authentication

*Internet Security*. Email authentication refers to technical standards that help internet service providers (ISPs) and other receivers validate the identity of an email sender. Three authentication standards are in use: [SPF](/docs/sendgrid/glossary/spf/), developed by AOL; [Sender ID](/docs/sendgrid/glossary/sender-id/), developed by Microsoft; and [DKIM](/docs/sendgrid/glossary/dkim/), developed by Yahoo!.