Email Deliverability & Authentication Checker
Test SPF, DKIM & DMARC Records in Seconds. Make sure your emails land in the inbox, not the spam folder. The HostsNiX Email Deliverability Checker scans your SPF, DKIM, and DMARC records to detect authentication issues, misconfigurations, and security gaps that can impact email delivery.
Whether you send transactional emails, marketing campaigns, or everyday business communications, strong email authentication helps improve inbox placement, protect your domain reputation, and build trust with email providers.
No signup required. Instant results.
How It Works
Enter Your Domain
Provide the domain you want to analyze.
Run the Scan
Our system retrieves SPF, DKIM, and DMARC DNS records and evaluates their configuration.
Review Results
Receive a detailed report showing authentication status, configuration issues, and recommendations for improvement.
What You’ll Receive After Every Deliverability Check
After analyzing your domain, you’ll receive:
SPF record validation
DKIM configuration analysis
DMARC policy verification
Authentication health score
DNS configuration insights
Deliverability risk indicators
Authentication compliance insights
Security recommendations
Actionable improvement suggestions
What Is Email Deliverability?
Email deliverability is the ability to get your emails into your recipients’ inboxes instead of spam folders or blocked queues. Email providers like Gmail, Outlook, Yahoo, and Apple Mail check authentication records to verify that your emails are genuine. They rely on standards such as SPF, DKIM, and DMARC to help prevent spoofing and phishing. Even a small mistake in these records can affect email delivery. Misconfigured DNS settings may reduce inbox placement, increase spam filtering, and harm your domain’s sender reputation over time.
What Affects Email Deliverability?
Several factors influence whether your emails reach the inbox or get filtered into spam folders.
Key deliverability factors include:
The HostsNiX Email Deliverability Checker focuses on the authentication and DNS factors that directly affect email delivery success.
What Does the Email Deliverability Checker Test?
Our tool performs DNS lookups and validates critical email authentication records. The HostsNiX Email Deliverability Checker functions as an SPF checker, DKIM checker, DMARC checker, and email authentication testing tool to help identify issues that may affect inbox placement.
SPF Record Validation
SPF (Sender Policy Framework) specifies which mail servers are authorized to send emails on behalf of your domain. The checker validates:
DKIM Record Validation
DKIM (DomainKeys Identified Mail) adds a cryptographic signature to outgoing emails to verify message integrity. The checker validates:
DMARC Record Validation
DMARC (Domain-based Message Authentication, Reporting & Conformance) tells receiving mail servers how to handle authentication failures. The checker validates:
What We Analyze
| DNS Record | Lookup Path | Validation Checks | Security Purpose |
|---|---|---|---|
| SPF | Root TXT Record | Syntax, authorized senders, DNS lookup count | Prevents unauthorized email sending |
| DKIM | selector._domainkey.domain | Public key structure, selector validity | Verifies email integrity |
| DMARC | _dmarc.domain | Policy, reporting, alignment settings | Controls authentication failures |
| Combined Result | All Records | Authentication alignment & policy consistency | Improves deliverability and trust |
Why Email Authentication Matters
Improve Inbox Placement
Authenticated emails are more likely to reach the inbox instead of being flagged as spam. This helps ensure your messages are seen by the right people.
Protect Your Domain Reputation
Email authentication helps prevent domain spoofing and unauthorized use of your domain. This protects your brand reputation and sender credibility.
Strengthen Email Security
SPF, DKIM, and DMARC add an extra layer of protection against phishing, spoofing, and fraudulent email activity.
Boost Email Performance
Better deliverability often leads to higher open rates, more clicks, and stronger engagement across your email campaigns.
Stay Compliant with Modern Email Standards
Major email providers increasingly expect proper authentication. Configuring SPF, DKIM, and DMARC helps maintain reliable email delivery and trust.
Common Email Authentication Issues We Detect
Many domains experience email delivery and security problems due to:
Why Choose HostsNiX Email Deliverability Checker?
Validate SPF, DKIM, and DMARC records quickly and understand exactly what to fix.
- Fast DNS Analysis — get results within seconds.
- No Registration Required — start checking domains immediately.
- Actionable Recommendations — understand exactly what needs to be fixed.
- Security-Focused Validation — identify vulnerabilities before they impact deliverability.
- Built for Website Owners & Businesses — designed for developers, agencies, hosting customers, and business owners.
Frequently Asked Questions
What is SPF?
SPF (Sender Policy Framework) is an email authentication method that identifies which mail servers are authorized to send emails on behalf of your domain.
What is DKIM?
DKIM (DomainKeys Identified Mail) adds a digital signature to your emails. This helps receiving servers verify that the message was not altered during delivery.
What is DMARC?
DMARC (Domain-based Message Authentication, Reporting, and Conformance) works with SPF and DKIM. It tells receiving mail servers how to handle emails that fail authentication checks.
Why are my emails going to spam?
Emails may end up in spam folders for several reasons. Common causes include missing SPF, DKIM, or DMARC records, authentication failures, poor sender reputation, or spam-triggering content.
Is this tool free?
Yes. The HostsNiX Email Deliverability Checker is completely free and available to anyone who wants to verify their email authentication settings.
Built on Email Authentication Best Practices
HostsNiX validates SPF, DKIM, and DMARC records using established email authentication standards and industry best practices. Our goal is to help businesses improve email deliverability, strengthen domain security, and protect their sender reputation.