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A comment on How does the Gmail unsubscribe button work?. Parent comment

Re:How does the Gmail unsubscribe button work? by sethammons on Friday May 29, 2020 @12:59PM (#23352462)
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.
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Re:How does the Gmail unsubscribe button work? by massaman_yams on Friday May 29, 2020 @05:06PM (#23355552)
Can confirm. Async bounces make up somewhere around a few percent of overall bounces for most senders.
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