How to configure SMTP setting for my nopCommerce?

To configure your SMTP setting for nopCommerce, go to Admin > Configuration > Email Accounts > Edit  

  Case 1: if you are using our SmarterMail service and host the site with us
             Email Address:    (it is your FROM email address)
    Email Display Name:    (set it as you like)
                             Host:    mail.yourdomain.com
                              Port:    25 (in the internal network of us, it must be set as 25)
                             User:    YourEmailLoginName (must same as the FROM email address)
                     Password:    YourEmailLoginPassword
                              SSL:    LeaveItBlank
Use default credentials:    LeaveItBlank         Case 2: if you are using an external email service (e.g. Gmail) and host the site with us                Email Address:    [email protected] (it is your FROM email address)
    Email Display Name:    (set it as you like)
                             Host:    smtp.gmail.com
                              Port:    587
                             User:    [email protected] (must same as the FROM email address)
                     Password:    YourEmailLoginPassword
                              SSL:    Tick
Use default credentials:    LeaveItBlank    
Remember, you just enter the correct Email address and Password as we require SMTP authentication before you can send out emails.