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In particular, this allows email addresses to use non-ASCII characters.Such addresses are supported by Google and Microsoft products, and promoted by some governments.Today's email systems are based on a store-and-forward model.Email servers accept, forward, deliver, and store messages.
Email first entered substantial use in the 1960s and by the mid-1970s had taken the form now recognized as email.
The Internet email message format is now defined by RFC 5322, with encoding of non-ASCII data and multimedia content attachments being defined in RFC 2045 through RFC 2049, collectively called Multipurpose Internet Mail Extensions or MIME.
RFC 5322 replaced the earlier RFC 2822 in 2008, and in turn RFC 2822 in 2001 replaced RFC 822 – which had been the standard for Internet email for nearly 20 years.
Over time, a complex web of gateways and routing systems linked many of them.
Many US universities were part of the ARPANET (created in the late-1960s), which aimed at software portability between its systems.