Host-based mailsystems
The original email systems allowed communication only between users who logged into the one host or "mainframe", but this could be hundreds or thousands of users within a company or university. By 1966 (or earlier, it is possible that the SAGE system had something similar some time before), such systems allowed email between different companies as long as they ran compatible operating systems, but not to other dissimilar systems.
Examples include BITNET, IBM PROFS, Digital All-in-1 and the original Unix mail.
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