1. Domain & DNS Issues

Domain Expired or Inactive: If your domain isn’t active, emails won’t come through. Make sure your domain is up to date.

MX Records: These tell email systems where to send your emails. If they’re wrong, your email won’t arrive. Make sure they point to your cPanel server.

Mail Routing: This should be set to “Local Mail Exchanger” in cPanel. If it’s set to “Remote,” your server won’t accept emails.

DNS Changes Take Time: If you just made DNS updates, it can take a few hours for the changes to work across the internet.

2. Server & Network Problems

Port 25 Blocked: This port is needed to receive email. If it’s blocked, ask your hosting provider to fix it.

Firewall Blocking Mail: Firewalls might be stopping email traffic. Make sure they’re not blocking important ports.

Internet Connection: A bad connection can cause problems checking email. Test by loading a few websites.

Check Server Logs: Email logs in cPanel can help you find out what’s going wrong.

3. Email Program (Client) Problems

Wrong Settings: Make sure your email app (Outlook, Apple Mail, etc.) is set up with the right info from cPanel.

Remove and Re-Add Account: Sometimes just removing your email account from your app and adding it again fixes things.

4. Other Possible Issues

Spam Filters: If spam filters like SpamAssassin are too strict, they might block good emails. Check your spam/junk folder and filter settings.

Full Mailbox: If your mailbox is full, new emails won’t be delivered. Clear space if needed.

Email Forwarding: Check if emails are being forwarded to another address without you realizing.

Blocked Senders: Make sure you haven’t accidentally blocked the person sending you emails.

Security Lockouts: If your account had too many wrong password attempts, it might be locked (cPHulkd does this). Unlock it in cPanel.

Stay Secure: Use strong passwords, check logs often, and back up your emails regularly just in case something goes wrong.