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② 後台搜尋「M Media Email Deliverability Inspector」→ 直接安裝（推薦）
原文外掛簡介
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
