When an email bounces back, it means it couldn't be delivered to the recipient and was returned to you with an error message. This usually includes a brief explanation of what went wrong.
Common reasons for bounced emails:
- Invalid email address – the recipient address doesn’t exist or was typed incorrectly.
- Mailbox full – the recipient’s inbox is full and can't accept new messages.
- Blocked or blacklisted – your message was rejected due to spam filters or blacklisting.
- Server issues – the recipient's mail server is temporarily unavailable or misconfigured.
- Attachment size too large – your email exceeds the recipient’s size limit.
What should I do?
- Read the error message – it often includes a code (e.g. 550, 552) and explanation.
- Check the recipient’s email address – look for typos.
- Try again later – if it’s a temporary issue like a full inbox.
- Open a new ticket if you're unsure what the message means or suspect server issues.
