What is an Email Bounce Rate?
The percentage of emails that couldn't be delivered to recipients.
How Email Bounce Rate Works
Email bounce rate measures the percentage of sent emails that failed to reach recipients' inboxes. Bounces are classified as "hard" (permanent failures like invalid addresses) or "soft" (temporary issues like full mailboxes or server problems).
Hard bounces indicate fundamental problems—the email address doesn't exist, the domain is invalid, or you've been blocked. Remove hard bounces immediately as they damage sender reputation. Soft bounces may resolve themselves, but repeated soft bounces to the same address should be treated as hard bounces. High bounce rates indicate list quality issues, often from purchased lists, old data, or poor acquisition practices. Most email platforms automatically suppress bounces, but monitoring the rate reveals list health trends.
Frequently Asked Questions
What is an Email Bounce Rate?
The percentage of emails that couldn't be delivered to recipients.
Email bounce rate measures the percentage of sent emails that failed to reach recipients' inboxes. Bounces are classified as "hard" (permanent failures like invalid addresses) or "soft" (temporary issues like full mailboxes or server problems).
Why is Email Bounce Rate important?
High bounce rates directly damage sender reputation, causing ISPs to filter more of your email to spam—even for valid addresses. Bounce rate is a primary factor in deliverability algorithms. Maintaining bounce rates under 2% is essential for healthy email marketing. Sudden bounce rate spikes often indicate technical issues or list corruption that need immediate attention.
How do you calculate Email Bounce Rate?
Bounce Rate = (Bounced Emails ÷ Total Emails Sent) × 100. For example, if you sent 20,000 emails and 300 bounced, your bounce rate is (300 ÷ 20,000) × 100 = 1.5%.