Bounce Rate

The percentage of sent emails that could not be delivered to the recipient's inbox.

What It Is

  • Hard Bounce: Permanent error (invalid email address, domain doesn’t exist).
  • Soft Bounce: Temporary error (mailbox full, server down).

Why It Matters

A high bounce rate (>2-3%) signals to ISPs that your data is bad and you are likely valid spammer. They will penalize your domain reputation.

Examples

  • Sending to ceo@company.com when the format is firstname.lastname@company.com.

Related Terms

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