Advanced email validation for Contact Form 7 using DNS/MX records and SMTP verification to prevent invalid email submissions.

Imtiaz Ahmed

Matrixlab

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.
<h4>Features</h4>
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
<h4>Benefits</h4>
<ul>
<li>Reduce email bounce rates</li>
<li>Protect your domain reputation</li>
<li>Improve email deliverability</li>
<li>Prevent spam and fake submissions</li>
<li>Better data quality for marketing campaigns</li>
</ul>
<h4>Requirements</h4>
<ul>
<li>WordPress 6.2 or higher</li>
<li>PHP 8.1 or higher</li>
<li>Contact Form 7 plugin</li>
</ul>

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