The sequential dumb strategy for send a list of e-mails continuously

sequential_dumb.php

<?php
$emailsList = News::giveMeNumberAvaiableEmailsAndMarkAsSending($numberOfEmails);
foreach ($emailsList as $email) {
    try {
        //This task delay seconds and this is bad
        $send = $email->send();
        $email->markAsSend();
    } catch (\Exception $e) {
        $email->markAsFailure($e->getMessage());
    }
}