Choose your SMTP mail server like (i.e. Amazon (SES) ),Send Grid o r Mail Chimp as the service provider for your SMTP mail server.
Go to Menu -> Settings ->configurations -> E-mail Server Settings
You can check the image as shown below:
Specify the SMTP host details
From E-mail - Specify the "From E-mail". This will be used as "From E-mail"
CC E-mail - Specify the CC E-mail
SMTP Host - Specify the hostname or IP address of your SMTP mail server. Eg. smtp.yourcompany.com
SMTP Port - The SMTP port number, usually 25 for SMTP or 465 for SMTPS, either of which are assumed if this field is left blank
Username - SMTP host requires authentication, specify the username of these authentication credentials here
Password - Specify the password associated with the username you specified above
TLS Switch - Default TLS check will be stored as "No". If it doesn't work. Switch to "Yes" and try again
Note : Test mail will be sent once your SMTP settings are verified. If not, error message will be displayed.