You can easily send mails using PHP code and Sendgrid.
<?php
require_once($_SERVER['WEBGLOO_LIB_ROOT']. '/ext/sendgrid-php/SendGrid_loader.php');
set_error_handler('offline_error_handler');
$sendgrid = new SendGrid('your-sendgrid-login', 'your-sendgrid-password');
$mail = new SendGrid\Mail();
$mail->addTo('foo@gmail.com')->
setFrom('foo@bestfishingrodsreview.com')->
setSubject('Sendgrid github PHP library test')->
setText('Hello World! from sendgrid library')->
setHtml('Hello World! from sendgrid github lib');
$response = $sendgrid->web->send($mail);
print_r($response);
// Complete script that i used for my domain // to send mails
?>