March 27th IS the date when vendors are supposed to start keeping records of buyers, their addresses, what their purchases were and what they cost, etc. and keep track of any/all taxes that apply and/or are due on those purchases in certain states (ie. sales taxes and specific other ones some states have on vaping stuff only). He also told me that's the reason many websites are shutting down online ordering from them by March 27th...not because of the mail ban, since there's no set in stone date that will take effect yet.