A Bounce means an email was not successfully delivered to the contact. The specific reasons behind the undeliverable address depend on the bounce type–Hard, Soft, General, or Still Trying. We’ll explain each type here:
These are email addresses that are totally unknown, obsolete, incorrect and will never be delivered to the recipient. These contacts are immediately suppressed. Most often these are old and expired addresses (If you spot obvious typos like firstname.lastname@example.org (instead of .com), you can unsuppress the contact and update the email.)
These are email accounts that often have full mailboxes, their domain is temporarily down, or they’re currently not able to receive email. Soft Bounces may indicate a temporary issue, so Mimi will keep these contacts in your active audience. If they continue to bounce several times in a row, they’ll be suppressed at that point.
The most common form of General Bounce happens when a firewall exists on the server of the recipient and prevents them from receiving email from outside their network. This is common in the case of corporations that do not receive email from unknown sources. General Bounces may indicate a temporary issue, so Mimi will keep these contacts in your active audience. If they continue to bounce several times in a row, they’ll be suppressed at that point.
These indicate that a particular message could not yet be delivered, but that the server is still trying. These bounces are usually resolved when retrying.