DefaultMessageIdHeaderHandler.php

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<?php

namespace Elgg\Email;

class DefaultMessageIdHeaderHandler {
    
    public function __invoke(\Elgg\Hook $hook) {
        $email = $hook->getValue();
        if (!$email instanceof \Elgg\Email) {
            return;
        }
        
        $hostname = parse_url(elgg_get_site_url(), PHP_URL_HOST);
        $url_path = parse_url(elgg_get_site_url(), PHP_URL_PATH);
        
        $mt = microtime(true);
        
        $email->addHeader('Message-ID', "{$url_path}.default.{$mt}@{$hostname}");
        
        return $email;
    }
}