Bounced emails are addresses that could not be delivered successfully to recipients of email marketing campaigns. There are two types of bounced emails: hard bounces, and soft bounces.
Hard bounces are addresses that were rejected outright. Possible reasons for a hard bounce could be because the recipient's address no longer exists or the email's domain name no longer exists. Hard bounced emails are flagged in your mailing list, as well as the email unsubscribes list, so that you do not send to those emails again when you send to the mailing list again. This is done to ensure your deliverability and IP reputation are not damaged from repeat sends to addresses where an email bounced back.
Soft bounces are addresses that were rejected due to a temporary issue, such as a recipient's email box being full. Since these reasons are temporary, we don't flag those addresses in your list or add them to the email suppression list right away because they may be able to be sent successfully when you mail again next time. However, after five consecutive unsuccessful attempts to deliver to a soft bounced email address it will be flagged as hard bounced. This is done to ensure that your email deliverability and IP reputation are not damaged from repeated sends to unengaged email addresses.
In the Email Marketing application:
In the CRM application: