Superhuman seems to have encountered this last year and they disabled read receipts by default: - https://www.theverge.com/2019/7/3/20681655/superhuman-email-a

Superhuman seems to have encountered this last year and they disabled read receipts by default: - https://www.theverge.com/2019/7/3/20681655/superhuman-email-app-spying-controversy-policy-change-read-receipts https://www.theverge.com/2019/7/3/20681655/superhuman-email-... - https://www.theverge.com/2019/7/3/20681655/superhuman-email-app-spying-controversy-policy-change-read-receipts https://www.theverge.com/2019/7/3/20681655/superhuman-email-...