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517 In late 1971, Ray Tomlinson sat at two side-by-side PDP-10s in a Cambridge office and sent a message from one to the other across ARPANET, picking the @ symbol off his Model 33 Teletype because it was the only punctuation that couldn’t appear in a user’s name

Silicon Canals
Silicon Canals Editorial Team @ Silicon Canals · 06/19/2026 07:35 EDT

In late 1971, Ray Tomlinson sat at two side-by-side PDP-10s in a Cambridge office and sent a message from one to the other across ARPANET, picking the @ symbol off his Model 33 Teletype because it was the only punctuation that couldn’t appear in a user’s name

On November 22, 1971, a 30-year-old BBN engineer named Ray Tomlinson stitched a file-transfer program to a local message tool and sent the first network email between two PDP-10s in the same Cambridge office. The separator he chose — the @ sign, picked because no human name could contain it — is now typed billions of times a day.

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