It's an option of the rule. Check the rule settings.
Check your error log to see if the email function generates an error. Then share it. Is the site live and other emails sent and received successfully?
- Need help? Post the URL of the related page (eventualy as confidential info), it will help solve your issue faster.
- An error, notice or warning? report the exact message including the line number
- If you get a white page , enable error reporting and / or check your server error logs.