When is it more professional not to send a business email

Disagreements

If you are having a disagreement with a coworker, or see potential for one, career coach Farnoosh Brock recommends you take the conversation offline. It’s easier to fly off the handle over a keyboard and say things you’d never say in person, plus “the last thing you need is a miscommunication via email to make matters worse.”

when the content is highly sensitive or emotional

the african society basically suffered the consequences of colonization and apartheid directly attacking the black people, first, during the colonialism and its main idea which which "white people" had better rights, affecting   them principally in the right to establish black people in their territories, access to quality education and health services and took away any civil right even to the black people to feel they have the same opportunities as the settlers.

put the trash into the back of the truck and drive the truck to the back. then you must unload the truck.