Anybody use GMail for the smtp server ?

Thanks! I am going to talk with the network guys and see if they can open it up for me.

This is not nopCommerce issue, all you need to enable 3rd party application to access your gmail account. Follow this steps to fix this:
1. Login to your gmail account.
2. Visit this page https://accounts.google.com/DisplayUnlockCaptcha and click on button to allow access.
3. Visit this page https://www.google.com/settings/security/lesssecureapps and enable access for less secure apps.
4. Login to your nopCommerce admin portal and visit this page http://website_name.com/Admin/EmailAccount/List and click edit  and click to delete the account.
5. Now use following details:
   Email address: [email protected]
   E display name: your website name
   Host: smtp.gmail.com
   User: [email protected]
   Password: password, remember to click change password button if you are editing any existing account
   SSL: tick to select it
   Use default credentials: uncheck, do not select it
6. Click on save button above.
7. Test the mailing by entering your email id and click on send test email button.

Very helpful itorian, The only thing I had to do in addition was make sure that my password was strong. If you have a weak password Google will deny you access without explanation.

New York wrote:

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Hi....

Using this setting, I did get any email notification.

Returns an error like as:
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.

So, how can I solve this error?
pls reply...

I use G Suite SMTP Relay, and it works well. The advantage is you should not store your GMail password on hosting because you can setup IP authentication.

https://support.google.com/a/answer/176600?hl=en