Sometimes mails can be directed to the Spam or Junk folders, for no reason and even though they shouldn't be treated as such.
Make sure you search through all those folders thoroughly and see if the emails you were expecting ended up there.
Make sure that your computer is connected to the Internet. Type any address (e.g. Google, Yahoo, etc.) in a web browser to check if you have access to the Internet.
If the page are not loading at all and you receive a "No Internet Connection" message of any kind, you need to try to reconnect to the Internet.
If you are still unable to go online, check out the No Internet Connection solutions.
If you can't send nor receive emails on your device, try restarting it.
After restarting your device, wait for a couple of minutes for everything to load and then check if you are able to receive mails, by sending one from another email account.
If you are not sure how to restart your device, check out the don't know how to restart my device guide.
You may have accidentally activated an email filter which filtered your emails, which explains the reason you are not able to see particular emails.
Check your email filters and make sure that they are set up correctly.
Note: If you are not sure how to find the filters (if any), check the email-service provider's help page.
Check if other programs that are running on your computer or mobile device prevent your email client from doing its tasks.
Usually, anti-virus software block email clients in order to protect you from online threats. If you have an antivirus software running, disable it and then check if you are able to receive emails, by sending yourself an email from another account or asking a friend to do that for you instead.
If this solved your issue, you can "tell" the antivirus software to stop blocking your email client via its Settings menu, or you can change the email software's (client's) settings.
If you don’t receive the email in the next 2 minutes please check your junk folder, and add [email protected] to your safe sender list.