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

This was extremely important in the early days of the Internet when network connections were undependable. However, this mechanism showed to be exploitable by originators of unsolicited bulk e-mail and as a consequence open mail relays have actually ended up being unusual, and numerous MTAs do decline messages from open mail relays.

The extensions in International email apply 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  Found Here , RFC 822 was based upon the earlier RFC 733 for the ARPANET. Internet e-mail messages consist of 2 sections, 'header' and 'body'.

The header is structured into fields such as From, To, CC, Topic, Date, and other info about the e-mail. In the procedure of transporting email messages in between systems, SMTP interacts delivery parameters and details using message header fields. The body includes the message, as disorganized text, sometimes containing a signature block at the end.

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RFC 5322 defines the syntax of the email header. Each e-mail message has a header (the "header section" of the message, according to the requirements), 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 value ("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 restricted to 7-bit ASCII characters. Some non-ASCII worths might be represented using MIME encoded words.