Description
Deliverability Inspector is a free diagnostic tool that helps you verify your email authentication and deliverability configuration. Ensure your emails reach the inbox by checking all critical DNS records and SMTP settings.
Key Features:
- SPF Record Check – Verify Sender Policy Framework configuration
- DKIM Verification – Check DomainKeys Identified Mail with custom selector support
- DMARC Policy Check – Validate Domain-based Message Authentication
- MX Records – Confirm mail exchange servers are configured
- PTR/Reverse DNS – Check server IP reverse DNS lookup
- SMTP Test – Send test emails to verify mail delivery works
Perfect For:
- WordPress site owners sending transactional emails
- Email marketers ensuring deliverability
- Developers setting up new WordPress installations
- Anyone troubleshooting email delivery issues
Why Use Deliverability Inspector?
Email deliverability is critical for WordPress sites. Whether you’re sending order confirmations, password resets, or newsletters, proper email authentication prevents your messages from landing in spam folders.
This plugin provides a comprehensive dashboard showing the status of all major email authentication protocols in one place, with actionable recommendations for fixes.
Free & Open Source
Deliverability Inspector is completely free with no premium upsells required for core functionality. Use it to verify your email setup is production-ready.
Works With M Media Dispatch
Once your deliverability checks pass, consider using M Media Dispatch to send professional email campaigns via your own SMTP server – no recurring email marketing costs!
External services
This plugin connects to Google’s public DNS over HTTPS (DoH) API as a fallback when the server’s native DNS resolver cannot retrieve records.
Service: Google Public DNS over HTTPS
Purpose: Resolving TXT, MX, and A DNS records for the domain being checked (SPF, DKIM, DMARC, MX lookups) when PHP’s dns_get_record() returns no results.
What is sent: The domain name being queried and the DNS record type requested.
When it is sent: Only when native DNS resolution fails for a given check. No data is sent on most servers where native DNS works correctly.
Provider: Google LLC
Terms of service: https://developers.google.com/terms
Privacy policy: https://policies.google.com/privacy
No personal user data (names, emails, IP addresses of site visitors, etc.) is ever sent to this service — only the domain name being inspected.
Privacy Policy
Deliverability Inspector performs DNS lookups and optional SMTP tests using your WordPress server. No data is sent to external services except:
- DNS queries to public DNS servers (standard internet protocol)
- Optional test email via your configured SMTP server
No personal data is collected, stored, or transmitted to M Media or any third parties.
Support
For support, visit M Media Support
Credits
Developed by M Media
Screenshots
Default dashboard view 
SPF check – pass 
DKIM check – pass 
DMARC check – pass 
MX records – pass 
PTR/reverse DNS – pass 
SMTP test – pass 
Test email sent confirmation 
SPF check – fail with recommendations 
DKIM check – fail with recommendations 
DMARC check – fail with recommendations 
MX records – fail with recommendations
Installation
- Upload the plugin files to
/wp-content/plugins/mmedia-email-deliverability-inspector/ - Activate the plugin through the ‘Plugins’ screen in WordPress
- Navigate to ‘Deliverability’ in the WordPress admin menu
- Click ‘Run All Checks’ to analyze your email configuration
FAQ
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What does this plugin check?
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The plugin checks:
– SPF (Sender Policy Framework) records
– DKIM (DomainKeys Identified Mail) with selector support
– DMARC (Domain-based Message Authentication) policy
– MX (Mail Exchange) records
– PTR (Reverse DNS) records
– SMTP email sending capability -
Do I need technical knowledge to use this?
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No! The plugin provides clear explanations for each check and actionable recommendations if issues are found.
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Will this plugin send emails?
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Only if you use the optional SMTP Test feature, which sends a single test email to an address you specify.
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Does this fix email delivery issues?
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This plugin diagnoses issues but does not automatically fix them. It provides clear recommendations for what needs to be configured with your DNS provider or hosting company.
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Is this plugin really free?
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Yes! All core functionality is completely free with no premium upgrades required.
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What happens after I pass all checks?
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Once your email authentication is properly configured, you can confidently send emails from WordPress.
Reviews
There are no reviews for this plugin.
Contributors & Developers
“M Media Email Deliverability Inspector” is open source software. The following people have contributed to this plugin.
Contributors
Translate “M Media Email Deliverability Inspector” into your language.
Interested in development?
Browse the code, check out the SVN repository, or subscribe to the development log by RSS.
Changelog
1.0.0
- Initial release
- SPF record verification
- DKIM record checking with selector support
- DMARC policy validation
- MX record lookup
- PTR/Reverse DNS checking
- SMTP connection test
- Comprehensive summary dashboard
- Export results as JSON
- Contextual recommendations for M Media Dispatch