Work through this checklist before opening a ticket:
- Read the bounce message. It usually states the reason in plain words, for example mailbox full or address does not exist.
- Check the address. A single typo in the recipient address is the most common cause.
- Check your password. If you recently changed it, update it on your phone and computer too.
- Check your mailbox size. In cPanel, open Email Accounts and look at the used space. A full mailbox cannot receive mail.
- Check attachment size. Large attachments are often refused. Try a smaller file or a sharing link.
- Check the settings. Outgoing mail needs authentication, port 465 with SSL/TLS.
If it still fails, open a Technical Support ticket and include the full bounce message, the sender and recipient addresses, and the time it happened. That lets us find the cause quickly.
