The Inbox Day
The Inbox Day is held on February 8. This event in the first decade of the month February is annual. 
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Email was invented to reach out to people. The first email was sent in 1971. There’s a popular claim that credits Ray Tomlinson as the father, or inventor, of email. Ray Tomlinson worked at research and design company Bolt, Beranek and Newman as a computer programmer. In 1971, he invented a messaging system that allows for easy, internal company communication.
Dr. Shiva Ayyadurai claims to be the inventor of email as we know it. Although this claim is widely considered false, Dr. Ayyadurai maintains his position as the email’s creator. According to his claim, he invented the electronic-messaging platform in 1978, at age 14, while working as a research fellow at the University of Medicine and Dentistry of New Jersey. He claims to have created a software called “EMAIL” for easy communication.
Similar holidays and events, festivals and interesting facts
Working Naked Day on February 7 (is founded by Lisa Kanarek);
Ballet Day on February 7 (Ballet found its origins during the Renaissance throughout Italy and France, though it had yet to evolve into the form we know it today);
Wave All Your Fingers at Your Neighbor Day on February 7
National Wear Red Day in United States on February 7 (celebrated on the first Friday in February);
Kite Flying Day on February 8
Laugh And Get Rich Day on February 8
Opera Day on February 8
Read In The Bathtub Day on February 9
Toothache Day on February 9 (It is so important that we learn how to take care of our teeth and not only get rid of nasty aches but also stop them coming back or turning into something more serious)