Legally dubious as you can't prove wether someone has read an email or not. Official correspondence has to occur through verifiable means (ex: having them login

Legally dubious as you can't prove wether someone has read an email or not. Official correspondence has to occur through verifiable means (ex: having them login to a portal, certified mail) in order to handle the approval in order to stand up to a challenge in court. I'm not a legal professional, and my advice shouldn't be taken as rule. Please consult an attorney.