Work through these common causes:
- Wrong password: reset it in cPanel > Email Accounts and update it in your app.
- Wrong server settings: confirm the incoming and outgoing servers, ports, and SSL match the article above.
- Mailbox full: if your mailbox is at its storage limit, new mail bounces. Delete large or old messages, or ask us to increase your quota.
- Sending limit reached: to prevent abuse, there is an hourly limit on outgoing mail. Bulk sending can trip this. Wait, then send in smaller batches.
- Domain or DNS issue: if MX records were changed, mail may go elsewhere. Check your DNS records or ask us.
If you have checked all of these and it still fails, open a ticket and include the exact error message you see. That helps us diagnose it quickly.
