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e-mail |
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The “at” sign, is part of every e-mail address. |
Header fields |
The message header should include at least the following fields: |
- From : The e-mail address, and optionally the name of the author(s). In many e-mail clients not changeable except through changing account settings.
- To : The e-mail address (es), and optionally name(s) of the message's recipient(s). Indicates primary recipients (multiple allowed), for secondary recipients see Cc: and Bcc: below.
- Subject : A brief summary of the topic of the message. Certain abbreviations are commonly used in the subject, including "RE:" and "FW:".
- Date : The local time and date when the message was written. Like the From: field, many email clients fill this in automatically when sending. The recipient's client may then display the time in the format and time zone local to her.
- Message-ID : Also an automatically generated field; used to prevent multiple delivery and for reference in In-Reply-To: (see below).
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| Note that the To: field is not necessarily related to the addresses to which the message is delivered. 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 "To:" field is similar to the addressing at the top of a conventional letter which is delivered according to the address on the outer envelope. Also note that the "From:" field does not have to be the real sender of the e-mail message. One reason is that it is very easy to fake the "From:" field and let a message seem to be from any mail address. It is possible to digitally sign e-mail, which is much harder to fake, but such signatures require extra programming and often external programs to verify. Some ISPs do not relay e-mail claiming to come from a domain not hosted by them, but very few (if any) check to make sure that the person or even e-mail address named in the "From:" field is the one associated with the connection. Some ISPs apply e-mail authentication systems to e-mail being sent through their MTA to allow other MTAs to detect forged spam that might appear to come from them. |
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| Common header fields for email include: |
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- Bcc: Blind Carbon Copy; addresses added to the SMTP delivery list but not (usually) listed in the message data, remaining invisible to other recipients.
- Cc: Carbon copy; Many e-mail clients will mark e-mail in your inbox differently depending on whether you are in the To: or Cc: list.
- Content-Type : Information about how the message is to be displayed, usually a MIME type.
- In-Reply-To: Message-ID of the message that this is a reply to. Used to link related messages together.
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Copyright © 2005-2011 Lots Enterprises (U) Limited. All rights reserved |
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