I am unable to send email.

If you're unable to send emails, here are a few troubleshooting steps you can try:

1. Check Internet Connection: Ensure your device is connected to the internet.

2. Email Account Settings: Verify that your email account settings (like server details, ports, etc.) are correctly configured.

3. Email Quota: Check if your email account has reached its storage limit.

4. Check for Errors: Look for any error messages that might indicate the problem.

5. Contact Administrator: Check with administrator if the private or public IP is blocked.