原解决方案链接为:
https://sugarclub.sugarcrm.com/dev-club/f/questions-answers/529/how-to-send-email-programmatically

代码为:

require_once('include/SugarPHPMailer.php');
$emailObj = new Email();
$defaults = $emailObj->getSystemDefaultEmail();
$mail = new SugarPHPMailer();
$mail->setMailerForSystem();
$mail->From = $defaults['email'];
$mail->FromName = $defaults['name'];
$mail->Subject = 'Put the title here';
$mail->Body = 'Put the body here';
$mail->addAttachment('/location/of/file/in/filesystem/file.csv', "name-of-attached-file-in-the-email.csv", Encoding::Base64, "text/csv");
$mail->prepForOutbound();
$mail->AddAddress('test@test.com');
@$mail->Send();