On: How does the Gmail unsubscribe button work?

[reaperducer]

Why would unsubscribing from your newsletter stop them from accessing the content? Is the content only delivered via the newsletter from which they unsubscribed?

[Swizec → reaperducer]

> A while later /../ migrate to a new platform. I need to tell every buyer that their account is moving. But some have unsubscribed from all emails.

They unsub'd all meaning "no more emails ever" as you said. How do I tell them the stuff moved if they don't want to be contacted ever again ever?

[reaperducer → Swizec]

You don't have to. When they can't find you, assuming they miss your content, they'll use this miracle tool called a "search engine" to find you.