Laura Spears learned a valuable lesson last month as she perused messages in her email account. The lesson: Don’t forget to check the spam folder. The value: $3 million. Spears, 55, of Oakland County won the Michigan Lottery’s Mega Millions prize on Dec. 31, the Michigan Lottery announced Monday. She matched the five white balls: 02-05-30-46-61 and won $1 million prize, which was multiplied to $3 million thanks to the “Megaplier.” People who play the lottery can spend $1 extra on a ticket to add the “Megaplier,” which could increase their winnings. Spears bought her ticket online after seeing …