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Hm. I never bothered to check, but I just assumed/hoped that there was RFC somewhere that allowed providers to ping a URL (specified in a domain record or simil
by lobster_johnson 15y ago
Hm. I never bothered to check, but I just assumed/hoped that there was RFC somewhere that allowed providers to ping a URL (specified in a domain record or similar) when the user marked something as spam. Can't find anything, so you're probably right, SendGrid gets that information "under the table" from email providers.
- eli 15y agoYou might be thinking of the List-Unsubscribe header which supposedly provides a machine-readable method of unsubscribing. But, no spam reports are all proprietary. And my guess is that they don't want actual spammers to get their hands on them lest they figure out how to tune their messages to avoid getting reported.