These components are described in the following diagram: The first five lines of an E-mail message is called E-mail header. It is possible that you may send e-mail to an unintended recipient.The header part comprises of following fields: The From field indicates the sender’s address i.e. The Date field indicates the date when the e-mail was sent. Junk emails are undesirable and inappropriate emails. It may be frustrating when the recipient does not read the e-mail and respond on a regular basis.Below is an example of what a header may look like.After this example we explain each of the major portions of the header and how to understand that data.MIME defines the mechanisms to encode binary or Unicode data into ASCII and embed the data in an E-mail message so that it can so that it can be sent using SMTP.
If the message is for someone who does not have a mailbox on your email server, the server forwards the message to another email server. It may go through several email servers until it reaches the email server on which the recipient of the message has a mailbox.For example, [email protected] an e-mail address where webmaster is username and is domain name. Apart from several benefits of E-mail, there also exists some disadvantages as discussed below: E-mail doesn’t prevent from forgery, that is, someone impersonating the sender, since sender is usually not authenticated in any way.E-mail message comprises of different components: E-mail Header, Greeting, Text, and Signature. It includes those recipient addresses whom we want to keep informed but not exactly the intended recipient. It is used when we do not want one or more of the recipients to know that someone else was copied on the message. Convenience of E-mail may result in a flood of mail.Although not all e-mail programs display this information because of privacy concerns, there are several programs that will.The Subject: line contains the subject of the e-mail.The To field indicates the recipient’s address i.e. and in comparison to networking and E-mail itself, it is relatively new.The line beginning with Return-Path: is what e-mail should be used if an error is encountered while the e-mail is being sent.Lines beginning with Received: contain each of the mail servers that the e-mail has passed through to get to your Inbox.The recipient should save the whole E-mail message to a temporary file and then run use the uudecode command as follows: Each of the MIME e-mail classes for building e-mail messages are subclasses of this class.What do e-mail headers have to do with security, or more pointedly, why a column about e-mail headers?