What is a hard bounce?

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Invalid email addresses : The most common cause of a hard bounce. If the email address does not exist (due to a typo, deactivation, or incorrect input), the email will never be delivered.
Full mailboxes : If the recipient's inbox is full, the email cannot be delivered temporarily. This usually results in a soft bounce.
Server issues : Problems on the recipient's email server, such as a down or overloaded server, can prevent email delivery. This is another cause of soft bounces.
Spam Filters : If your email is flagged as spam by the laos girl telegram recipient's email system, it may result in a bounce. This is usually due to a poor sender reputation or suspicious content in the email.
Non-existent domains : If the domain name (such as gmail.com, yahoo.com) is incorrect or has expired, the email will bounce. This can result in a hard bounce.
While email bounces are a natural part of email marketing, industry benchmarks suggest that a bounce rate of less than 2% is normal. Anything higher than that indicates there may be issues with your email list quality, deliverability, or overall campaign performance.


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 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.