These settings are used to send the Email to Users by giving respective Email details to perform the perfect action.
Mail Host: A mail host resolves email addresses that provide your network with a remote connection.
Mail Port: Email servers across the Internet use protocols for sending and retrieving emails service which listens to a specific port to deliver services.
Mail Driver: The program which interacts with a particular email by a server.
By default, mail trap details are used to email settings. In the above Mail Driver, you can use mail trap, SMTP, Sendmail, etc.