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I looked it up SD; the idea of an email *address* was a little foreign, until RFC 720 (Aug 1976) formalized things like the @ symbol. (Instead of actually writing "at"!)
But that only applied to the ARPANet, which eventually matured to be the general-purpose Intarweb we all know and love. Honeywell would have been pushing its own proprietary email system on its own proprietary network.
ARPANet eventually defined methods for exchanging email with non-ARPANet networks with RFC 754... In April 1979.
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