Managing bounces and keeping your sender reputation

Read the reason behind the bounce label

A hard bounce generally signals a permanent failure for that delivery attempt, while a soft bounce usually describes a temporary condition. Provider labels are summaries, so retain the SMTP response and diagnostic text rather than relying only on the dashboard category.

A permanent failure does not always mean the address is nonexistent; policy and authentication failures can also prevent delivery. Distinguish invalid recipients from blocks, configuration problems and temporary deferrals before choosing an action.

Apply different actions to different failures

Suppress confirmed invalid addresses from future campaigns and correct the source record where appropriate. Do not repeatedly resend to the same invalid destination or invent address variations in an attempt to reach the person.

For temporary failures, use the sending provider's retry behavior and avoid launching duplicate manual attempts. For policy or authentication rejections, pause the affected stream and investigate the sending identity, infrastructure or recipient-provider guidance.

• Save the response code and diagnostic text.
• Suppress confirmed invalid recipients.
• Let the provider manage normal retries.
• Pause patterns of policy rejection.
• Assign configuration issues to an administrator.
• Record the resolution before resuming.

Look for shared causes across failures

Group bounces by data source, receiving domain, sending service and campaign start date. A cluster tied to one imported list suggests a different cause from failures that begin after a DNS or provider configuration change.

Use both counts and denominators when reviewing the pattern so a tiny sample does not look more conclusive than it is. Preserve enough operational detail to troubleshoot while avoiding unnecessary retention of message content or personal data.

Prevent the same problem from returning

Synchronize suppression records across the CRM, outreach tools and any external operator so the next import cannot silently reactivate failed addresses. Review whether the contact source needs correction, replacement or removal from the workflow.

Address verification can reduce some address-quality problems, but it cannot guarantee delivery, relevance or permission. Maintain narrow targeting and monitor complaints as well as bounces because technically accepted unwanted mail can still damage sender reputation.