Top Definition
(n.) - Email letters and messages that arrive in your inbox overnight while you are sleeping, often from people in different time zones around the world
"Every morning I check my night-mail to see if anything urgent arrived from overseas. With all these time zones worldwide, you never know who is going to email you and when!"

-- overheard at a watercooler at the UN building in Manhattan
by PRwiz101 August 31, 2009

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