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I work for an email service provider. While we usually get a response from the inbox provider that an inbox does not exist, we totally get async bounces all the

I work for an email service provider. While we usually get a response from the inbox provider that an inbox does not exist, we totally get async bounces all the time. Some providers accept the mail and realize later that they cannot deliver it.

massaman_yams 6y ago
Can confirm. Async bounces make up somewhere around a few percent of overall bounces for most senders.