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by chuckadams
896 days ago
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That's up to the MUA, but I imagine that they would at least show an error dialog. If the backend of that POST is broken, then the spam complaints are going to rack up, which will get the list blocked, List-Unsubscribe header or no (some of the most notorious spammers around were actually quite scrupulous about having said header, which they would actually obey ... temporarily) |
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