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An email soft bounce usually indicates a temporary delivery problem, while a hard bounce generally indicates a permanent reason the message could not be delivered. Mailchimp explains that receiving systems and provider handling can vary. The classification is a starting point for investigation, not permission to resend indefinitely. Read the provider’s reason codes and follow its suppression policies before deciding what to do next.
Read the reason behind the label
A mailbox may be full, temporarily unavailable or subject to a policy rejection. A nonexistent address or permanent block may be handled as a hard bounce. Provider categories do not capture every situation perfectly. Retain the relevant timestamp, campaign and redacted reason so the issue can be understood without exposing message contents or personal data broadly.
Respect suppression and consent
Allow the sending platform to apply its documented retry and suppression behavior. Do not export failed addresses to a second provider to bypass the first provider’s controls. If a legitimate customer reports an incorrect address, verify the correction through an appropriate process. An address that technically exists does not establish permission to send marketing messages.
Look for a pattern before changing the whole system
A cluster at one receiving domain may warrant a different investigation from random typing errors. Check recent sender changes, authentication and provider status. Avoid assuming every failure means the domain is permanently damaged. Use approved support channels and evidence, not aggressive resend experiments that increase complaints or unwanted traffic.
A practical checklist
- Read the provider’s detailed reason code.
- Keep the campaign and timestamp context.
- Respect suppression and retry rules.
- Verify address corrections appropriately.
- Investigate patterns without bypassing recipient protections.
Worked example
Illustrative example: several operational notices fail because the recipient mailbox is temporarily full. The provider applies its documented retry behavior. A separate misspelled address is treated differently and corrected only after the authorized recipient supplies the right address. Neither situation justifies adding either person to a marketing list or repeatedly sending from new accounts.
Common questions
Can a valid address hard bounce? Mailchimp notes that it can. Are all soft bounces harmless? No; persistent failures need attention. Should a suppressed contact be re-added automatically? Follow the provider’s rules and the actual evidence. Does address validity prove consent? No.
What to do next
Review bounce handling as part of routine mail operations. Keep records proportionate and limit access to recipient information. A careful response protects both business communication and recipient preferences instead of turning failed delivery into repeated unwanted messages.