Mail-11 is a mail transfer protocol used in the RSX-11 operating system, which was developed by Digital Equipment Corporation (DEC) in the late 20th century. Mail-11 facilitated the exchange of electronic mail between users on the same system or across different systems connected via network links. Key features of Mail-11 include support for the creation, sending, and receiving of messages, as well as the handling of attachments and user directories.
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