I'm new to Jhispter and I created an application using the `yeoman generator` for Jhipster.

When I logged as an admin to this application to check the `Health checks` section I noticed that email service is down and the details says this :

```
com.sun.mail.util.MailConnectException: Couldn't connect to host, port: localhost, 25; timeout -1

```

How can I solve this problem ?