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What is Hard Bounce?

Quick Answer

A permanent email delivery failure due to an invalid, non-existent, or blocked email address.

Hard bounces occur when an email can't be delivered due to a permanent problem: the email address doesn't exist, the domain doesn't exist, or the receiving server has permanently blocked your IP. Hard bounce rate should be below 2% — higher rates signal poor list quality and damage sender reputation. MisarMail automatically suppresses hard bounced addresses from all future sends to protect your reputation.

Related Terms

Soft Bounce

A temporary email delivery failure due to a full mailbox, server issue, or message too large.

Bounce Rate

The percentage of emails that couldn't be delivered to the recipient's mailbox.

List Hygiene

The practice of regularly cleaning your email list by removing invalid, inactive, and unengaged subscribers.

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