---
title: "Domain Authentication Checker | DMARC Report"
description: "Check SPF, DMARC, BIMI, MTA-STS, and TLS-RPT records for any domain. Free email authentication audit tool by DMARC Report."
image: "https://dmarcreport.com/images/og-default.png"
canonical: "https://dmarcreport.com/tools/domain-auth-checker/"
---

## Understanding Email Authentication Protocols

### SPF (Sender Policy Framework)

SPF specifies which mail servers are authorized to send email for your domain. It works by publishing a DNS TXT record that lists approved IP addresses and hostnames. Receiving servers check this record to verify that incoming mail comes from an authorized source.

### DMARC (Domain-based Message Authentication)

DMARC ties SPF and DKIM together and tells receiving mail servers what to do when neither authentication method passes - reject, quarantine, or allow the message. It also enables aggregate and forensic reporting so domain owners can monitor authentication results.

### BIMI (Brand Indicators for Message Identification)

BIMI lets organizations display their brand logo next to authenticated emails in supporting email clients. It requires a valid DMARC policy (quarantine or reject) and optionally a Verified Mark Certificate (VMC) for logo display in Gmail and Apple Mail.

### MTA-STS (Mail Transfer Agent Strict Transport Security)

MTA-STS tells sending mail servers that your domain requires TLS encryption for email delivery. It prevents downgrade attacks and man-in-the-middle interception by publishing a DNS record and a policy file that mandate encrypted connections.

### TLS-RPT (TLS Reporting)

TLS-RPT enables receiving mail servers to report TLS connection failures back to you. When combined with MTA-STS, it provides visibility into delivery problems caused by certificate errors, expired certificates, or misconfigured encryption.

## Why All 5 Protocols Matter

### Anti-Spoofing

SPF + DMARC prevent unauthorized senders from impersonating your domain.

### Encryption

MTA-STS + TLS-RPT ensure email is encrypted in transit and report failures.

### Brand Trust

BIMI displays your logo in the inbox, increasing recipient confidence and open rates.

## Need help fixing your email authentication?

DMARC Report monitors SPF, DKIM, and DMARC across all your domains and shows you exactly what to fix. Setup takes 60 seconds.

[Start Free Trial](https://app.dmarcreport.com/login)

## Protecting Domains Worldwide

![G2 Leader - DMARC](https://media.mailhop.org/dmarcreport/images/g2-badges/DMARC_Leader_Leader.png)

Rated 4.8/5 on G2 · 469 verified reviews

![G2 Momentum Leader - DMARC](https://media.mailhop.org/dmarcreport/images/g2-badges/DMARC_MomentumLeader_Leader.png)

VU

Verified User in Information Technology and Services

5/5

### "Best security tool for your own domains"

The weekly reports help me a lot to analyze quickly the emails sent from my domains and that gives me peace of mind.

8/31/2022Verified on G2

RC

Ryan C.

Director

4.5/5

### "Control Centre for Email Security"

I like that we can see and check all reports on just 1 platform. We manage multiple domains, and monitoring them all in one place is essential.

8/29/2022Verified on G2

eg

eddy g.

Director

4.5/5

### "A great solution to a common email problem."

I have been using them for the last month after my Google business email started giving DMARC errors. I didn't even know what it meant at that time. After a little googling I found that people can spoof it as well. So far so good — the best thing is it protects every email.

8/29/2022Verified on G2

[Read all 469 reviews on G2 →](https://www.g2.com/products/dmarc-report/reviews)

```json
{"@context":"https://schema.org","@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com","logo":{"@type":"ImageObject","url":"https://dmarcreport.com/images/dmarcreport-logo.png"},"description":"DMARC reporting and email authentication management. Monitor aggregate and forensic DMARC reports, analyze authentication results, and enforce DMARC policies across all your domains.","parentOrganization":{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138883901","name":"DuoCircle LLC","url":"https://www.duocircle.com","sameAs":["https://www.wikidata.org/wiki/Q138883901","https://www.crunchbase.com/organization/duocircle-llc","https://www.linkedin.com/company/duocircle","https://github.com/duocircle"],"subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}]},"sameAs":["https://www.wikidata.org/wiki/Q138898167","https://www.linkedin.com/company/duocircle","https://x.com/duocirclellc","https://www.g2.com/products/dmarc-report/reviews","https://github.com/duocircle","https://www.crunchbase.com/organization/duocircle-llc","https://www.trustradius.com/products/duocircle/reviews"],"aggregateRating":{"@type":"AggregateRating","ratingValue":"4.8","reviewCount":"470","bestRating":"5","worstRating":"1","url":"https://www.g2.com/products/dmarc-report/reviews"},"contactPoint":{"@type":"ContactPoint","contactType":"customer support","url":"https://dmarcreport.com/support/"},"knowsAbout":["DMARC","DMARC Reporting","DMARC Aggregate Reports","DMARC Forensic Reports","Sender Policy Framework","DKIM","Email Authentication","Email Security","DNS Management","Email Deliverability"]}
```

```json
{"@context":"https://schema.org","@type":"WebSite","name":"DMARC Report","url":"https://dmarcreport.com","description":"DMARC reporting and email authentication management. Monitor aggregate and forensic DMARC reports, analyze authentication results, and enforce DMARC policies across all your domains.","publisher":{"@type":"Organization","name":"DMARC Report","url":"https://dmarcreport.com","logo":{"@type":"ImageObject","url":"https://dmarcreport.com/images/dmarcreport-logo.png"},"description":"DMARC reporting and email authentication management. Monitor aggregate and forensic DMARC reports, analyze authentication results, and enforce DMARC policies across all your domains.","parentOrganization":{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138883901","name":"DuoCircle LLC","url":"https://www.duocircle.com","sameAs":["https://www.wikidata.org/wiki/Q138883901","https://www.crunchbase.com/organization/duocircle-llc","https://www.linkedin.com/company/duocircle","https://github.com/duocircle"],"subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}]}}}
```

```json
[{"@context":"https://schema.org","@type":"SoftwareApplication","name":"Domain Authentication Checker","applicationCategory":"WebApplication","operatingSystem":"Web","description":"Check SPF, DMARC, BIMI, MTA-STS, and TLS-RPT records for any domain. Free email authentication audit tool by DMARC Report.","url":"https://dmarcreport.com/tools/domain-auth-checker/","offers":{"@type":"Offer","price":"0","priceCurrency":"USD"},"provider":{"@type":"Organization","name":"DMARC Report","url":"https://dmarcreport.com"},"aggregateRating":{"@type":"AggregateRating","ratingValue":"4.8","reviewCount":"470","bestRating":"5","worstRating":"1"}}]
```

```json
{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://dmarcreport.com/"},{"@type":"ListItem","position":2,"name":"Domain Auth Checker","item":"https://dmarcreport.com/domain-auth-checker/"}]}
```