> This isn't generally required by law (but please correct me if I'm wrong; it's been some time since I worked in the email industry.) I was thinking of commer

> This isn't generally required by law (but please correct me if I'm wrong; it's been some time since I worked in the email industry.) I was thinking of commercial, not transactional email at that time. For that, the law that I'm familiar with: https://www.acm.nl/nl/verkoop-aan-consumenten/reclame-en-verleiden/spam-voorkomen-uw-reclame#maak-afmelden-makkelijk https://www.acm.nl/nl/verkoop-aan-consumenten/reclame-en-ver... and I tend to assume that most things that we have in the Netherlands are EU-wide, either in spirit or by being EU-originated legislation. Checking Wikipedia's spam article, four clicks and some ctrl+f'ing later, yes: > provided that customers clearly and distinctly are given the opportunity to object, free of charge and in an easy manner, to such use of electronic contact details [...] on the occasion of each message https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:02002L0058-20091219 https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CEL... Came into effect in July 2002 For transactional email, I don't really see the point of unsubscribe links. What's one-click unsubscribe supposed to do when you press it on a StreamSeries invoice, cancel your subscription because they won't be able to invoice you anymore for the streaming service? The only legitimate instance that comes to mind is if a third party filled in your email address and is triggering the emails to annoy you, then unsubscribe could make sense, but that could also just be prevented from happening by doing the (typical) email validation step.