Free IT Security & Diagnostic Tools 2026
Professional-grade email security analysis and network diagnostic tools, completely free. Check DMARC, SPF, DKIM records and test VoIP connectivity with instant results. Built by South Florida's trusted IT experts.
Email Authentication & Security Tools
Protect your domain from email spoofing, improve deliverability, and ensure your messages reach the inbox. Our free tools analyze DMARC, SPF, and DKIM records to identify configuration issues and provide expert recommendations.
DMARC Record Checker
Instantly validate your DMARC record and get comprehensive email authentication analysis. Check policy levels, alignment modes, and receive expert recommendations to protect your domain from spoofing.
- Instant DMARC lookup
- Policy analysis (none/quarantine/reject)
- SPF & DKIM verification
- Security score grading
- Actionable recommendations
SPF Record Validator
Analyze your SPF record configuration and ensure proper email sender authorization. Check DNS lookup counts, validate syntax, and identify issues before they affect email deliverability.
- SPF record validation
- DNS lookup count (max 10)
- Syntax error detection
- Authorization verification
- Include statement analysis
DKIM Signature Checker
Verify DKIM signatures and public key records to ensure email integrity. Test cryptographic signatures, check selector configuration, and validate that your emails are properly authenticated.
- DKIM signature validation
- Public key verification
- Selector checking
- Cryptographic analysis
- Common provider support
Network & VoIP Diagnostic Tools
Test your business phone system connectivity and diagnose VoIP issues with our comprehensive SIP testing tool.
How to Use Our Free Tools
Get instant security analysis in three simple steps. No registration, no credit card, no hassle.
Select Your Tool
Choose the appropriate tool for your needs: DMARC Checker for overall email authentication, SPF Checker for sender authorization, DKIM Checker for signature verification, or SIP Phone Test for VoIP diagnostics.
Enter Your Domain
Type your domain name (e.g., yourdomain.com) into the input field. For the SIP Phone Test, enter your SIP credentials. No registration or account creation required—just enter and go.
Analyze Results
Review the instant analysis results, including security scores, configuration details, and color-coded status indicators. Follow the actionable recommendations to improve your email security or network configuration.
Why Email Authentication Matters
Email authentication protocols like DMARC, SPF, and DKIM are critical for protecting your domain from email spoofing, phishing attacks, and brand impersonation. Without proper authentication, cybercriminals can send fraudulent emails that appear to come from your organization.
Beyond security, email authentication dramatically improves deliverability. Major email providers like Gmail, Outlook, and Yahoo prioritize authenticated emails, meaning your legitimate messages are more likely to reach the inbox instead of spam folders.
Our free tools help you verify your email authentication configuration and identify issues before they impact your business communications.
Key Benefits
Prevent Email Spoofing
Stop cybercriminals from impersonating your domain in phishing attacks
Improve Deliverability
Authenticated emails reach inboxes, not spam folders
Protect Brand Reputation
Build trust with customers who know your emails are authentic
Gain Visibility
DMARC reports show who's sending email using your domain
Why Use Autonimate's Free IT Tools
Professional-grade analysis backed by decades of IT security expertise
Instant Results
Get comprehensive analysis in seconds, not hours. No waiting for reports.
No Registration
Use all tools without creating an account. Your privacy is protected.
Expert-Backed
Built by IT professionals with 15+ years of email security experience.
Actionable Recommendations
Clear, step-by-step guidance on fixing identified issues.
Common Email Security Issues & Solutions
Troubleshoot the most frequent email authentication problems with our expert guidance
Emails Going to Spam
Often caused by missing or misconfigured SPF, DKIM, or DMARC records. Use our checkers to verify authentication is properly configured.
Use DMARC CheckerDMARC Alignment Failures
Occurs when the From header domain doesn't match the SPF or DKIM authenticated domain. Check alignment modes and ensure proper configuration.
Use DMARC CheckerSPF "Too Many DNS Lookups" Error
SPF records are limited to 10 DNS lookups. Our SPF Checker counts lookups and helps you optimize your record.
Use SPF CheckerDKIM Signature Not Found
DKIM requires proper DNS configuration and email server setup. Verify your DKIM records are published and signing is enabled.
Use DKIM CheckerEmail Authentication Best Practices
Follow this proven implementation strategy for maximum email security
Start with SPF
Configure your SPF record first to authorize mail servers. Keep it under 10 DNS lookups and include all legitimate sending sources.
Add DKIM Signatures
Enable DKIM signing on your email platform and publish public keys in DNS. Use 2048-bit keys for better security.
Implement DMARC with p=none
Start with monitoring mode (p=none) to collect reports without affecting email delivery. Set up aggregate report collection.
Monitor and Fix Issues
Analyze DMARC reports for 2-4 weeks. Identify and fix any legitimate sources failing authentication before enforcement.
Progress to p=quarantine
Once reports are clean, move to quarantine mode. Failing emails go to spam, providing a safety net.
Enforce with p=reject
After confirming all legitimate email passes, move to reject mode for maximum protection against spoofing.
Platform-Specific Email Configuration
Tailored guidance for the most popular email platforms
Microsoft 365 Email Authentication
- SPF automatically includes Microsoft servers with include:spf.protection.outlook.com
- Enable DKIM in Microsoft 365 Defender portal and add CNAME records to DNS
- DMARC record goes at _dmarc.yourdomain.com in your DNS provider
- Use relaxed alignment mode for compatibility with Microsoft's infrastructure
Google Workspace Email Setup
- SPF includes Google servers with include:_spf.google.com
- Enable DKIM in Google Workspace Admin console and add TXT record to DNS
- Google uses selector "google" by default for DKIM signatures
- DMARC works seamlessly with Google Workspace—no special configuration needed
When to Use These Tools
Common scenarios where our free IT tools provide immediate value
IT Administrators
- Verify email authentication after migration
- Troubleshoot deliverability issues
- Audit domain security posture
- Test VoIP phone system connectivity
Marketing Teams
- Ensure campaigns reach inboxes
- Check authentication before major sends
- Diagnose spam folder issues
- Verify third-party sender configuration
Business Owners
- Protect brand from email spoofing
- Improve customer email delivery
- Verify IT vendor configurations
- Test new phone system setup
Frequently Asked Questions About Email Security Tools
Get answers to common questions about email authentication and our free tools
What is DMARC and why do I need it?
DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email authentication protocol that protects your domain from being used in phishing attacks and email spoofing. Without DMARC, anyone can send emails pretending to be from your domain. DMARC tells receiving email servers what to do when emails fail authentication—deliver, quarantine, or reject them. It also provides reports showing who is sending email using your domain.
Check Your DMARCHow do I check my SPF record?
Use our free SPF Checker tool to instantly validate your SPF record. Simply enter your domain name, and our tool will look up your SPF record in DNS, analyze its syntax, count DNS lookups (must be 10 or fewer), and verify that authorized mail servers are properly listed.
Check SPF RecordWhat does DKIM do for email security?
DKIM (DomainKeys Identified Mail) adds a cryptographic signature to outgoing emails, proving they genuinely came from your domain and weren't modified in transit. The sending server signs the message with a private key, and receiving servers verify it using a public key published in your DNS. Unlike SPF, DKIM signatures survive email forwarding.
Verify DKIMWhy are my emails going to spam?
Emails often go to spam due to missing or misconfigured email authentication (SPF, DKIM, DMARC). Other causes include poor sender reputation, content triggering spam filters, or being on a blacklist. Start by checking your authentication records using our free tools.
Diagnose IssuesHow do I fix DMARC alignment failures?
DMARC alignment failures occur when the domain in your From header doesn't match the domain authenticated by SPF or DKIM. For SPF alignment, ensure your Return-Path domain matches your From domain. For DKIM alignment, the d= domain in the DKIM signature must match your From domain.
Check AlignmentWhat's the difference between SPF, DKIM, and DMARC?
SPF specifies which mail servers are authorized to send email for your domain. DKIM adds a cryptographic signature to prove the email genuinely came from your domain. DMARC builds on both by adding a policy layer that tells receivers what to do when emails fail authentication, plus it provides reporting.
Learn MoreHow long does it take for DNS changes to propagate?
DNS changes for DMARC, SPF, and DKIM typically propagate within 1-48 hours, depending on your DNS provider's TTL settings. Most changes are visible within a few hours. When moving from p=none to p=quarantine or p=reject, we recommend waiting at least 2 weeks of clean reports before each escalation.
Can I use these tools for Microsoft 365 or Google Workspace?
Yes, our tools work with all email platforms including Microsoft 365, Google Workspace, Exchange, and any other email system. Both Microsoft 365 and Google Workspace fully support DMARC, SPF, and DKIM. Our checkers analyze the DNS records for your domain, regardless of which email platform you use.
Email ServicesNeed Professional Email Security Setup?
Our cybersecurity experts can implement DMARC, SPF, and DKIM correctly—protecting your domain from spoofing while ensuring your legitimate emails are delivered. Based in Deerfield Beach, serving all of South Florida.
Serving businesses across South Florida — Free IT security tools built by Autonimate in Deerfield Beach