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In the context of email delivery errors, 'Hard' bounces refer to permanent delivery failures (such as an invalid email address), 'Soft' bounces are temporary delivery issues (such as a full inbox), and 'Unreachable' typically means that the email server could not be reached or is not responding. These terms categorize delivery errors based on their nature and help in analyzing the deliverability issues of an email campaign.References:The categorization of bounce types into Hard, Soft, and Unreachable is standard terminology in email marketing for classifying delivery errors.