In Mail Settings, You can choose your mail platform from SMTP, Mailgun, Sparkpost and Mandrill. And then you can set your respective mail settings to send Notifications.     

Go to GET STARTED -> Manager Settings  OR    

Sidebar Menu -> Settings    

Click on "VIEW" in the block "Mail Settings" for sender mail settings.    

    Click on "VIEW" button in Mail Settings block opens mail settings page which is shown as below    

1. Choose your mail platform from 1.SMTP, 2.Mailgun, 3.Sparkpost and 4.Mandrill    

2. Fill the respective fields for chosen mail platforms    

3. Click SAVE to apply settings.    

Please follow the below docs for details mail setups for each mail platform     

 1. How to setup SMTP mail settings ?    

 2. How to setup MAILGUN mail settings ?     

 3. How to setup SPARKPOST mail settings ?    

  4. How to setup MANDRILL mail settings ?