Here you get the option to use either of these three. These are used for sending emails and based on availability choose either of them. All of them will work fine to send an email.
Next comes SMTP host followed by the SMTP port field, here enter the details you received from your mail servers. Then, enter the Username and Password that has to be set up for Email purposes.
Another thing to consider is to ensure the port number is open on your server. If you have any query get connected with your hosting provider.
Under the Mandrill API, simply enter the API key. This is one you have received from the mail server.
Under the Sengrid API, simply enter the API key.
Now save it by clicking on the save button and you can check it by clicking here to send a test email button. A popup appears asking you for the email address. Enter it and you will get the test email.
