The Network World IT department was hard at work last weekend trying to unclog the arteries of our Exchange servers. People tend to get a lot of e-mail in this company -- and the place has more than its share of pack rats.One missive about the project from Director of Network IT Rocco Bortone included an off-handed Civil War reference, followed by this:"Since we are on the subject of e-mail and history ... Did you know Ray Tomlinson, the inventor of the software that allowed messages to be sent between computers, sent the first e-mail in October 1971.\u00a0 This year will make it the 35th anniversary.""For those of you who may have that message, please delete it.\u00a0 :)"Apparently, no one has it, not even my co-workers who never met an e-mail they didn't believe warranted saving. According to Tomlinson's site: "The first message of any substance was a message announcing the availability of network e-mail. The exact content is unknown, but it gave instructions about using the 'at' sign to separate the user's name from his host computer name."Two days later Tomlinson started getting spam.