This tool is used when you don't want a big MTA on your box. Reasons are maybe if you want to relay your mail over the one of your provider or you have a powerful mail server in your company which manages the queue. This means that nbsmtp does not manage your local mail queue, it does only send it to a hub. . The above is all it does. To use nbsmtp you will also need an account on a SMTP-server which allows you to relay over it. . Homepage: