# Email Authentication: A Developer's Guide

DevFeed: [Email Authentication: A Developer's Guide](<https://devfeed.tech/articles/email-authentication-a-developer-s-guide-82679.md>)

Original publisher: [Read original article](<https://resend.com/blog/email-authentication-a-developers-guide>)

Author: Jonni Lundy

Published: 2023-08-25T00:00:00Z

Content type: tutorial

Language: en

Sources: [Resend](<https://devfeed.tech/sources/resend.md>)

Topics: [email](<https://devfeed.tech/topics/email.md>), [DNS security](<https://devfeed.tech/topics/dns-security.md>), [DNSSEC](<https://devfeed.tech/topics/dnssec.md>), [Secure token management](<https://devfeed.tech/topics/secure-token-management.md>), [certificates](<https://devfeed.tech/topics/certificates.md>)

Tags: [authentication](<https://devfeed.tech/tags/authentication.md>), [digicert](<https://devfeed.tech/tags/digicert.md>), [dns](<https://devfeed.tech/tags/dns.md>), [domain](<https://devfeed.tech/tags/domain.md>), [email](<https://devfeed.tech/tags/email.md>), [guide](<https://devfeed.tech/tags/guide.md>), [guides](<https://devfeed.tech/tags/guides.md>), [hacks](<https://devfeed.tech/tags/hacks.md>), [https](<https://devfeed.tech/tags/https.md>), [mail](<https://devfeed.tech/tags/mail.md>), [password](<https://devfeed.tech/tags/password.md>), [public-key](<https://devfeed.tech/tags/public-key.md>)

## AI overview

The guide explains how SPF, DKIM, DMARC, and BIMI support email authentication and delivery. It describes SPF's authorized sending origins, DKIM's message signatures, DMARC's handling of failed checks, and BIMI's display of verified branding in inboxes. It also notes that Resend handles SPF and DKIM when a domain is added.

## Source excerpt

Learn the importance of SPF, DKIM, DMARC, and BIMI in ensuring email delivery.