WordPress CRM Email Verification for FluentCRM & FluentSMTP

<?php
/**
 * WordPress snippet (functions.php or WPCode / Code Snippets plugin):
 * Verify new FluentCRM & Fluent Forms subscribers via MailVeri API before marking as 'subscribed'.
 */
add_filter('fluentcrm_before_subscriber_insert', function ($subscriberData) {
    if (empty($subscriberData['email'])) {
        return $subscriberData;
    }

    $response = wp_remote_post('https://app.mailveri.com/api/verify-mails/', [
        'timeout' => 8,
        'headers' => [
            'Authorization' => 'Bearer mv_live_your_api_key_here',
            'Content-Type'  => 'application/json',
        ],
        'body'    => wp_json_encode([
            'emails' => [$subscriberData['email']],
        ]),
    ]);

    if (is_wp_error($response)) {
        return $subscriberData; // Fail-open on network timeout
    }

    $payload = json_decode(wp_remote_retrieve_body($response), true);
    $status  = $payload['results'][0]['status'] ?? 'UNKNOWN';

    // Block disposable burner emails & hard-bounce invalid addresses from entering Amazon SES
    if (in_array($status, ['INVALID', 'DISPOSABLE'], true)) {
        $subscriberData['status'] = 'bounced';
    } elseif ($status === 'CATCH_ALL') {
        $subscriberData['status'] = 'pending'; // Hold catch-all for double opt-in confirmation
    }

    return $subscriberData;
}, 10, 1);

<?php
/**
 * Real-time Fluent Forms / Elementor Forms / Gravity Forms email field gate:
 * Reject disposable & non-existent emails on submit with a clean user-facing message.
 */
add_filter('fluentform/validate_input_item_input_email', function ($errorMessage, $field, $formData) {
    $fieldName = $field['name'] ?? 'email';
    $email     = sanitize_email($formData[$fieldName] ?? '');

    if (empty($email)) {
        return $errorMessage;
    }

    $response = wp_remote_post('https://app.mailveri.com/api/verify-mails/', [
        'timeout' => 6,
        'headers' => [
            'Authorization' => 'Bearer mv_live_your_api_key_here',
            'Content-Type'  => 'application/json',
        ],
        'body'    => wp_json_encode(['emails' => [$email]]),
    ]);

    if (!is_wp_error($response)) {
        $body   = json_decode(wp_remote_retrieve_body($response), true);
        $status = $body['results'][0]['status'] ?? 'UNKNOWN';

        if ($status === 'DISPOSABLE') {
            return 'Please enter a permanent work or personal email address (temporary inboxes are not allowed).';
        }
        if ($status === 'INVALID') {
            return 'This email address could not be verified. Please check for typos.';
        }
    }

    return $errorMessage;
}, 10, 3);