If you are not able to receive or send emails, here is a list of steps you can take to troubleshoot the issue:

1. Check your network connection: Make sure you have an active internet connection, and you should be able to access websites.
2. Check your incoming and outgoing mail server settings: Verify your username and password correctly.
3. Check your spam folder: Make sure any emails you are expecting are not in spam folders.
4. Check your email client: If you are using a mail client like Microsoft Outlook or Mac Mail, make sure it is configured correctly.
5. Disable any antivirus and malware blocking programs: Such programs may block the emails coming in.
6. Contact your mail service provider: If all else fails, you may need to contact your mail service provider.