The SMTP settings instruct CompleteFTP how to send emails. They are the same settings that are used when setting up email applications, such as Microsoft Outlook.
CompleteFTP sends emails from (1) email notification events, (2) forgot/reset password feature, (3) custom JSS scripts.
At a minimum a host-name must be defined. The most common ports are 25 if no encryption is being used and 465 or 587 is encryption is being used. If encryption is used the SSL/TLS must be checked.
Most SMTP servers require authentication, so the username and password should usually be set. Many SMTP servers related to online email services, such as Gmail, require special passwords to be generated for use with applications such as CompleteFTP.
The default 'from' email address is used whenever a 'from' address isn't specified.
Clicking the 'Test' button will cause a test email to be sent to a specified 'to' address, which may be entered when prompted. Note that CompleteFTP Manager will freeze while the test message is being sent, which may take up to 30 seconds if the connection times out.