Starting May 5, Microsoft will require DMARC.

Check if your domain is compliant.
DOMAIN checker icon

Check your domain now

Enter your domain for an instant security scan and detailed authentication report.

Understanding Email Authentication Protocols

When attackers impersonate your domain, both your reputation and revenue are at risk. These essential protocols work together to protect your brand, secure customer communications, and prevent email fraud.

DMARC

Critically Important

DMARC (Domain-based Message Authentication, Reporting and Conformance) is a widely adopted standard for verifying sender identity. It provides visibility into all services sending on behalf of your domain and enables organizations to enforce policies that prevent brand impersonation and executive-targeted phishing attacks.

How Skysnag helps:

Skysnag automates DMARC onboarding, ensures alignment with SPF and DKIM, and delivers actionable reporting so your domain is fully protected and monitored.

SPF

Critically Important

SPF (Sender Policy Framework) defines which IP addresses are authorized to send email using your domain. It's foundational to email authentication, but legacy implementations are prone to misconfigurations and DNS lookup failures.

How Skysnag helps:

Skysnag maintains an optimized, flattened SPF record - automatically detecting your sending sources and preventing delivery issues caused by excessive DNS lookups.

DKIM

Critically Important

DKIM (DomainKeys Identified Mail) adds a cryptographic signature to outgoing email, allowing receiving servers to verify that the message was sent from an authorized server and has not been altered in transit. When aligned with the domain in the "From" address, DKIM is a core pillar of email authentication.

How Skysnag helps:

Skysnag monitors DKIM alignment, manages key rotation across providers, and ensures signatures are valid - removing the complexity of handling DKIM manually.

MTA-STS

Recommended

MTA-STS (Mail Transfer Agent - Strict Transport Security) is a security protocol that forces encrypted delivery (TLS) for emails sent to your domain. Without it, attackers can intercept messages using downgrade or man-in-the-middle attacks.

How Skysnag helps:

Skysnag automates the setup and maintenance of MTA-STS policies through DNS, ensuring your domain enforces secure transmission standards with no manual intervention.

TLS-RPT

Recommended

TLS-RPT (Transport Layer Security Reporting) works alongside MTA-STS to report failed or downgraded attempts to deliver email securely. It provides insight into mail delivery issues and potential interception risks.

How Skysnag helps:

Skysnag aggregates TLS-RPT reports and transforms them into clear, actionable dashboards - helping you monitor secure email delivery across all providers.

BIMI

Strategic Reputation Boost

BIMI (Brand Indicators for Message Identification) allows your organization's logo to appear next to authenticated emails in supported inboxes. It requires full email authentication and enhances brand recognition, trust, and engagement in the inbox.

How Skysnag helps:

Skysnag handles BIMI end-to-end, from hosting compliant SVG logos to managing VMC certificates - ensuring your emails stand out visually and securely.

Transform your email security

Get real results with Skysnag's comprehensive email authentication services

100%

of email domain abuse phishing blocked

99%

email authentication rate

40%

increase in open rates

34%

increase in purchase intent

Talk to an expert to review your authentication gaps.

Meet with one of our experts to review your report. We'll walk you through the issues, explain the security gaps, and show you exactly how Skysnag resolves them - automatically.

Discuss my results

See everything Skysnag has to offer

Skysnag gives you everything you need to enforce DMARC, automate SPF and DKIM, deploy MTA-STS and TLS-RPT, and activate BIMI - so your emails are secure, compliant, and trusted.

Monitor

Identify email compromise attempts and troubleshoot email delivery issues

Comply

Comply with Microsoft, Google and Yahoo requirements and visualize sending data in real-time

Protect

Automate DMARC enforcement for unparalleled email security

Certify

Certify your brand with the highest identity standard globally

Start for free