Earlier quoted context omitted.
To be fair, if people are marking your emails as spam frequently enough to get your IPs/domains blacklisted then it suggests the system is working as designed and you shouldn’t be sending whatever you’re sending to those people.
Nah, about 2% of my "Thank you for ordering, here is your receipt" mails also get marked as spam. Some number of people just smack the "spam" button for nearly everything that is automated, and those "spam" buttons seem to work on absolute numbers not percentages; so if you have a high number of people in the pool then you will be false flagged eventually. We had a very explicit double opt-in system, made it super ea…
When I buy something, I get a notification from my bank, instantly, that's basically the receipt in a standardized compact form (2 lines of text) with the amount in my local currency. This is much more useful than the receipts online stores send where the relevant details are buried in some huge html template and the amount needs to be converted.
When I buy something in a physical store they have the decency to ask if I want a receipt. I don't understand why that's such a hard concept for online stores/services to get, ask me if I want a receipt, don't just stick it in my inbox because you have my email address.