The email came more than a month before the first Orange County inspection of Fun Spot's Orlando location.
Disney World is asking guests who can't wear a face mask to reschedule their visits for a later date.
An Orange County team found both parks to be in compliance with county rules on face masks and physical distancing.
The reports obtained by Theme Park Tribune found many Fun Spot guests were not wearing masks after Orange County, Florida's mask mandate went into effect.
Fun Spot America owner John Arie shared posts on Facebook that falsely claimed face masks could cause a harmful buildup of carbon dioxide and oxygen deprivation.
Guests are encouraged, but not required to wear face masks, though coverings will be required for the park's food and beverage employees and any workers who handle cash.
Suggestions for theme parks from the Orange County Economic Recovery Task Force include mandatory masks and temperature checks for employees and limiting park capacity.
Icon Park and Fun Spot America's two parks will be closing due to the COVID-19 pandemic, with no timeline for when they may reopen.