Formidable - Emails not sending or receiving
Some users have experienced an issue where email notifications are not sending or receiving.
If you haven't setup form actions yet, you'll want to do this first. See this article: https://formidableforms.com/knowledgebase/email-notifications/
If you have done that but aren't seeing the emails, double-check in your spam/junk folders.
If the emails are not there, then it's most likely that there is an issue with your hosting provider not sending email properly. You can check to ensure your web host has enabled the php script allowing email to be sent form the website.
Or alternatively you can use an SMTP plugin to authenticate emails and bypass the server.