My mail app isn't working

Sorry to hear that your mail app isn't working! Can you please provide more details about the issue you're experiencing? For example:

1. What type of mail app are you using (e.g. Gmail, Outlook, Yahoo)?
2. What is the error message you're seeing (if any)?
3. Are you able to send emails, but not receive them? Or is it the other way around?
4. Have you made any recent changes to your account settings or device?
5. Are you using a desktop app, mobile app, or web-based app?

The more information you can provide, the better I'll be able to help you troubleshoot the issue!