You do not necessarily need to have an SMPT server running locally, it is just the one way to do this. You just need to have access to an SMTP server that will send out the emails. If you have one running on another computer on the network this should also work. With a working SMTP server referenced in the settings it should send out an email. If you were able to get emails sending before locally then there must have been a server running in the location specified.