An e-mail that cannot be delivered to the mailbox provider and is sent back to the e-mail Service Provider that sent it. A bounce is classified as either “hard” or “soft.” Hard bounces are the failed delivery of e-mail due to a permanent reason, such as a non-existent address. Soft bounces are the failed delivery of e-mail due to a temporary issue, such as a full inbox or an unavailable ISP server.
Ref #IAB
Ref #IAB
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