If your instance is not configured to send out email, you have several options to choose from. One option is to use a service called SendGrid. You can sign up on their site and obtain an API key. To start using with WordPress, you simply install a plugin called WP Mail SMTP and supply the API key on the plugin and off you go. I use Contact Form 7 to send out email from a form. There are no issues using Contact Form 7 and SendGrid. In addition to SendGrid, the plugin also works with other email providers such as AWS, Gmail, Outlook, Zoho, Mailgun to name just a few.