Email Queue, CSAT, And Email Piping

Area	Main pieces	Extension points
Email queue	`ALSP_Email_Queue`, `alsp_mail_queue`	`alsp_mailqueue_add`, `alsp_mailqueue_add_data`, `alsp_mailqueue_before_sending`, `alsp_mailqueue_after`
CSAT	`alsp_csat_responses`, survey token model, frontend survey renderer	`alsp_csat_survey_ready`, `alsp_csat_survey_submitted`, `alsp_csat_survey_email_template`
Email piping	IMAP/Gmail/Microsoft importers, spam quarantine, multi-inbox settings	`alsp_ep_email_is_valid`, `alsp_ep_spam_check_result`, `alsp_ep_spam_detected`

add_filter('alsp_mailqueue_before_sending', function (array $mail): array {
    $mail['subject'] = '[Support] ' . $mail['subject'];
    return $mail;
});

add_filter('alsp_ep_email_is_valid', function (bool $valid, array $param): bool {
    if (!$valid) {
        return false;
    }

    $from = strtolower((string) ($param['from_email'] ?? ''));
    return substr($from, -strlen('@blocked-example.test')) !== '@blocked-example.test';
}, 10, 2);

add_action('alsp_csat_survey_submitted', function (int $response_id, int $rating, string $comment, $response): void {
    if ($rating <= 2) {
        my_alert_support_lead_about_low_rating($response_id, $comment);
    }
}, 10, 4);