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In the process of transporting email messages between systems, SMTP communicates delivery parameters and information using message header fields.The body contains the message, as unstructured text, sometimes containing a signature block at the end.For example, several writers in the early 1970s used the term to describe fax document transmission.As a result, it is difficult to find the first citation for the use of the term with the more specific meaning it has today.RFC 3864 describes registration procedures for message header fields at the IANA; it provides for permanent and provisional field names, including also fields defined for MIME, netnews, and HTTP, and referencing relevant RFCs.Common header fields for email include: Note that the To: field is not necessarily related to the addresses to which the message is delivered.
replacing previous experimental extensions, to allow UTF-8 encoded Unicode characters to be used within the header.
Neither the users nor their computers are required to be online simultaneously; they need to connect only briefly, typically to a mail server or a webmail interface, for as long as it takes to send or receive messages.
Originally an ASCII text-only communications medium, Internet email was extended by Multipurpose Internet Mail Extensions (MIME) to carry text in other character sets and multimedia content attachments.
Today's email systems are based on a store-and-forward model.
Email servers accept, forward, deliver, and store messages.