Email Basics: Common Email Features

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Bob might pick up his e-mail in many ways, for instance logging into mx. b.org and reading it directly, or by using a webmail service. Domains usually have several mail exchange servers so that they can continue to accept mail even if the primary is not offered. Many MTAs utilized to accept messages for any recipient on the Internet and do their best to deliver them.

This was really crucial in the early days of the Web when network connections were undependable. However, this mechanism proved to be exploitable by originators of unsolicited bulk e-mail and as a consequence open mail relays have ended up being rare, and many MTAs do decline messages from open mail relays.

The extensions in International e-mail use only to email. RFC 5322 replaced the earlier RFC 2822 in 2008, then RFC 2822 in 2001 replaced RFC 822 the standard for Web e-mail for decades. Released in 1982, RFC 822 was based on the earlier RFC 733 for the ARPANET. Internet e-mail messages consist of 2 areas, 'header' and 'body'.

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The header is structured into fields such as From, To, CC, Topic, Date, and other information about the e-mail. In  This Site  of transporting e-mail messages in between systems, SMTP interacts delivery specifications and details utilizing message header fields. The body contains the message, as unstructured text, sometimes containing a signature block at the end.

RFC 5322 specifies the syntax of the email header. Each email message has a header (the "header area" of the message, according to the spec), comprising a variety of fields ("header fields"). Each field has a name ("field name" or "header field name"), followed by the separator character ":", and a worth ("field body" or "header field body").

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It ends with the separator character ":". The separator is followed by the field value (the "field body"). The value can continue onto subsequent lines if those lines have area or tab as their first character. Field names and, without SMTPUTF8, field bodies are limited to 7-bit ASCII characters. Some non-ASCII worths may be represented using MIME encoded words.