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A comment on Sendgrid under siege from hacked accounts. Parent comment

Re:Sendgrid under siege from hacked accounts by Arnavion on Sunday August 30, 2020 @04:33AM (#24322165)
GMail prompting you to unsubscribe is because the email carries a standard [1] header (List-Unsubscribe) and GMail detects it. They may also be using some smarts to detect unsubscribable emails that don't have the header, but in general it's because of the header. It doesn't have anything to do with distinguishing between spam and legitimate subscriptions.

So if you mark a legitimate subscription as spam and don't unsubscribe when gmail prompts you to, it's likely that it'll get sent to your spam in the future, and perhaps contribute to the sender's spam score which affects other people's inboxes too.

[1]: de-facto standard? I can't find any RFC for it.

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Re:Sendgrid under siege from hacked accounts by DyslexicAtheist on Monday August 31, 2020 @04:32AM (#24329484)
actually I wasn't talking about mailing lists (I'd never move something from majordomo or similar to spam since I 100% know why I received them). But I'm talking about corporate news letters delivered by services like MailChimp and other marketing tech. - No idea if these have a List-Unsubscribe header - but even if they do I shouldn't have received the message in the first place (in most cases).
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