MTX Email DNS Validator for Contact Form 7 prevents users from submitting contact forms with non-existent or invalid email addresses by performing DNS/MX record validation before form submission.

Features

Validation
* DNS/MX Record Validation – Verifies email domains have valid MX records
* SMTP Mailbox Verification – Advanced validation that checks if the specific email address/mailbox exists
* Abstract API Integration – Comprehensive third-party email validation with quality scoring, risk assessment, and breach detection
* Catch-All Domain Detection – Optionally reject domains that accept any email address (available in DNS+SMTP mode)
* Disposable Email Detection – Block temporary/throwaway email addresses (via Abstract API)
* Role-Based Email Detection – Identify generic addresses like info@, admin@, support@ (via Abstract API)
* Three Validation Modes:
– DNS Only (Fast) – Validates domain can receive emails (~0.5s)
– DNS + SMTP (Thorough) – Validates both domain and specific mailbox (~2-5s)
– Abstract API (Advanced) – Comprehensive validation with quality scoring, risk assessment, and more
* Per-Form Configuration – Configure validation settings for each CF7 form individually
* Custom Error Messages – Set global or per-form error messages

Admin Interface
* Tabbed Interface – Organized Settings and Tools tabs for better UX
* Modern React Admin – Beautiful admin interface built with React 18 and Ant Design 5
* Welcome Pointer – Helpful onboarding tooltip for first-time users
* Import/Export Settings – Backup and migrate settings with JSON export/import
* Cache Management – Clear DNS cache on demand from Tools tab
* UI Preferences – Per-user interface settings (reset welcome pointer)

Performance & Data
* Validation Logging – Track all validation attempts with detailed logs and statistics
* Expandable Log Details – View comprehensive validation data including deliverability, quality scores, risk assessment, domain info, and breach history
* DNS Caching – Improves performance by caching DNS lookups (24-hour default)
* Data Cleanup Control – Choose whether to delete all plugin data on uninstall
* Multiple Click Protection – Prevents duplicate requests from rapid button clicks

Developer Features
* Extensible Hooks – Filters and actions for custom validation logic
* REST API – Full REST API for settings and logs management
* Translation Ready – Fully internationalized and localization-ready
* WordPress Coding Standards – Follows WordPress PHP and JavaScript standards

Benefits

Reduce email bounce rates
Protect your domain reputation
Improve email deliverability
Prevent spam and fake submissions
Better data quality for marketing campaigns

Requirements

WordPress 6.2 or higher
PHP 8.1 or higher
Contact Form 7 plugin