If you are hosting your own mail server, a procmail recipe shouldn't be too difficult. I run mimedefang, so could do it there too, but that's a whole lot of overkill if you don't already have that.
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That would be neat. I recently started using Fastmail which offers a feature for this. They have some info on how it works which could give ideas to selfhost. Like which headers it uses. https://www.fastmail.help/hc/en-us/articles/6905792637967-Unsubscribe
I never noticed fastmail has this, probably because I don't use the webmail interface as often. Thanks for the tip!
Yeah I didn’t see the option until I started using their mobile app.