Why do my clients receive emails from no-reply@spuritmail.com, and not from the e-mail indicated in Email Templates section?

To have your email as a sender, you will need to have it verified by clicking the link sent to your email from Amazon.

Set the email you want to use as the sender, then you will receive an email from Amazon when you save the settings on this page.

If you didn't verify it, the email would be sent from the no-reply@spuritmail.com.