When was the first e-mail message sent?

2001
1991
1981
1971
The service consisting in sending text messages between computers was invented in 1971 by Ray Tomlinson. Previously, mail could be sent only to others who used the same computer. To achieve this,"Ray" he used the @ sign to separate the user name from the name of their machine, a scheme which has been used in email addresses ever since.
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Answers by country

2001
1991
1981
1971
answers
flagIndia
16%
21%
21%
39%
73
flagthe United Kingdom
2%
40%
20%
37%
35
flagPoland
12%
35%
19%
31%
3040
flagGermany
7%
34%
30%
26%
26
flagthe United States
15%
31%
31%
21%
38