Some non-ASCII values may be represented using MIME encoded words.Email header fields can be multi-line, and each line should be at most 78 characters long and in no event more than 998 characters long.Many US universities were part of the ARPANET (created in the late-1960s), which aimed at software portability between its systems.

The history of modern Internet email services reaches back to the early ARPANET, with standards for encoding email messages published as early as 1973 (RFC 561).

An email message sent in the early 1970s looks very similar to a basic email sent today.

.action_button.action_button:active.action_button:hover.action_button:focus.action_button:hover.action_button:focus .count.action_button:hover .count.action_button:focus .count:before.action_button:hover .count:before.u-margin-left--sm.u-flex.u-flex-auto.u-flex-none.bullet.

Error Banner.fade_out.modal_overlay.modal_overlay .modal_wrapper.modal_overlay [email protected](max-width:630px)@media(max-width:630px).modal_overlay .modal_fixed_close.modal_overlay .modal_fixed_close:before.modal_overlay .modal_fixed_close:before.modal_overlay .modal_fixed_close:before.modal_overlay .modal_fixed_close:hover:before.

The header is structured into fields such as From, To, CC, Subject, Date, and other information about the email.

In the process of transporting email messages between systems, SMTP communicates delivery parameters and information using message header fields.

For a time in the late 1980s and early 1990s, it seemed likely that either a proprietary commercial system or the X.400 email system, part of the Government Open Systems Interconnection Profile (GOSIP), would predominate.

However, once the final restrictions on carrying commercial traffic over the Internet ended in 1995, Many MTAs used to accept messages for any recipient on the Internet and do their best to deliver them. This was very important in the early days of the Internet when network connections were unreliable.

The body contains the message, as unstructured text, sometimes containing a signature block at the end.