The specific format used is often indicated by special filename extensions: HTML email messages often include an automatically generated plain text copy as well, for compatibility reasons. Users can retrieve their messages from servers using standard protocols such as POP or IMAP , or, as is more likely in a large corporate environment, with a proprietary protocol specific to Novell Groupwise , Lotus Notes or Microsoft Exchange Servers. The email address es , and optionally name s of the message's recipient s. A brief summary of the topic of the message. Information about how the message is to be displayed, usually a MIME type. Common header fields for email include:
In some countries, several encoding schemes coexist; as the result, by default, the message in a non-Latin alphabet language appears in non-readable form the only exception is coincidence, when the sender and receiver use the same encoding scheme. Filename extensions Upon reception of email messages, email client applications save messages in operating system files in the file system. Standard formats for mailboxes include Maildir and mbox. Header fields Email header fields can be multi-line, and each line should be at most 78 characters long and in no event more than characters long. Alice may not have a MUA on her computer but instead may connect to a webmail service. Other fields that are added on top of the header by the receiving server may be called trace fields, in a broader sense. If Alice and Bob work for the same company, the entire transaction may happen completely within a single corporate email system. For a time in the late s and early s, it seemed likely that either a proprietary commercial system or the X. Some mail servers apply email authentication systems to messages being relayed. Also an automatically generated field; used to prevent multiple delivery and for reference in In-Reply-To: Message header Each message has exactly one header , which is structured into fields. The field name starts in the first character of the line and ends before the separator character ": Such addresses are supported by Google and Microsoft products, and promoted by some governments. Blind carbon copy ; addresses are usually only specified during SMTP delivery, and not usually listed in the message header. The recipient's client may then display the time in the format and time zone local to them. The local time and date when the message was written. The server sends or receives email via the Internet through the product's Internet mail gateway which also does any necessary reformatting. Informally, each line of text in the header that begins with a non- whitespace printable character begins a separate field. Some Microsoft email clients allow rich formatting using their proprietary Rich Text Format RTF , but this should be avoided unless the recipient is guaranteed to have a compatible email client. Server-side storage is often in a proprietary format but since access is through a standard protocol such as IMAP , moving email from one server to another can be done with any MUA supporting the protocol. For example, several writers in the early s used the term to describe fax document transmission. Carbon copy ; Many email clients will mark email in one's inbox differently depending on whether they are in the To: SMTP defines the trace information of a message, which is also saved in the header using the following two fields: The actual delivery list is supplied separately to the transport protocol, SMTP , which may or may not originally have been extracted from the header content. The value is continued onto subsequent lines if those lines have a space or tab as their first character. Each field has a name and a value. The email address , and optionally the name of the author s.
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