An email bounce happens when a message cannot be delivered and the sending system returns a failure notice.
Key Points
- Hard bounces usually indicate permanent issues such as an invalid address or blocked destination.
- Soft bounces often point to temporary issues such as a full mailbox or a receiving server problem.
- DNS problems, sender reputation issues and missing SPF or DKIM records can also affect delivery.
- Reading the bounce message carefully helps identify whether the issue is technical, policy-related or address-specific.
- Regular mailbox maintenance and correct authentication records reduce many common bounce problems.
Frequently Asked Questions
Why does one address bounce while others work?
That mailbox may be invalid, full, disabled or blocked by a policy rule.
Can spam filters cause bounces?
Yes. A receiving provider can reject mail based on reputation or authentication failure.
Should I keep retrying?
Only if the bounce is temporary. Permanent errors usually need a real fix first.
Need More Help?
If you need help with domains, hosting, email, DNS or transfers, contact Toothless Domains support with the exact domain name and the issue you want solved.
