Custom Validation in Contact Form 7

Custom Validation in Contact Form 7 — a practical guide to Contact Form 7 custom validation with clear examples you can reuse in real projects.

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Short description

Custom validation is ideal for phone formats, disposable email blocks, or cross-field rules.

Validation filter sketch

add_filter('wpcf7_validate_email*', function ($result, $tag) {
    // inspect posted value; $result->invalidate($tag, 'message');
    return $result;
}, 20, 2);