By default Strapi provides a local email system. You might want to send email with a third party.
You can check all the available providers developed by the community on npmjs.org - [Providers list](https://www.npmjs.com/search?q=strapi-provider-email-)
If you want to create your own, make sure the name starts with `strapi-provider-email-` (duplicating an existing one will be easier), modify the `auth` config object and customize the `send` function.