What is a hard bounce?

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A hard bounce is a permanent failure in the delivery of an email. It usually occurs when an email address is invalid or the recipient's domain does not exist. Once an email bounces, it can never be delivered to that address and continuing to send emails to that address can damage your email reputation.

Common causes of strong bounces
Invalid or non-existent email addresses : A estonia mobile database misspelled or non-existent email address is the leading cause of hard bounces.
Incorrect domain : If the domain (such as gmail.com or yahoo.com) does not exist, the email will not be delivered.
Blocked email addresses : Some email addresses may be blacklisted or marked as spam, resulting in immediate rejection.
Inactive mailboxes : Sometimes your email provider may deactivate email addresses that have been inactive for too long, resulting in a hard bounce.
How to identify hard bounces ?
Hard bounces are easy to identify because they generate specific error messages or codes from the recipient's server. These messages may say things like "Recipient address rejected," "Domain not found," or "Email address does not exist." Once you receive such a message, you know that the email address is invalid.

Impact on your email marketing
Hard bounces are a serious concern for email marketers. When your emails bounce consistently, email service providers (ESPs) take it as a sign of poor list management and may reduce your sender reputation or even block your future emails from reaching inboxes. That’s why removing addresses with hard bounces from your list as soon as possible is essential to maintaining good deliverability.