https://www.ftc.gov/tips-advice/business-center/guidance/can-spam-act-compliance-guide-business https://www.ftc.gov/tips-advice/business-center/guidance/can...

https://www.ftc.gov/tips-advice/business-center/guidance/can-spam-act-compliance-guide-business https://www.ftc.gov/tips-advice/business-center/guidance/can... There is definitely a legal way to send these emails in the USA.