Hard Bounce

What is it?

What is it?

A "Hard Bounce" signifies the permanent failure of an email delivery attempt due to a persistent issue, such as an invalid recipient address or a non-existent domain. Unlike soft bounces denote temporary delivery failures, hard bounces indicate unrecoverable issues, prompting email senders to rectify problems, such as removing invalid addresses from mailing lists.

Key points to remember

Key points to remember

  • Permanent Failure: Hard bounces result from issues preventing email delivery, like invalid recipient addresses or non-existent domains.

  • Causes: Common causes include invalid email addresses, non-existent domains, or blocked email servers.


  • Impact on Sender Reputation: High hard bounce rates can adversely affect the sender's reputation and email deliverability.


  • List Hygiene: Prompt removal of invalid addresses from mailing lists is crucial for maintaining list hygiene and preserving the sender's reputation.


  • Automated Handling: Email platforms often automatically handle hard bounces by removing bounced addresses from lists and preventing future delivery attempts.

Example of Use

Example of Use

  1. Email Marketing Campaigns: After sending a promotional email campaign, the sender reviews complex bounce notifications to identify delivery issues and enhance list hygiene for future campaigns.


  2. Subscription Management: An online service automatically removes hard-bounced email addresses from its subscriber database to ensure only valid and active subscribers receive updates.

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