s3.bay0.hotmail.com. Message-id is a unique string assigned by the mail system
when the message is first created.
From: This indicates the email address of the sender of the mail. In the given
example, the sender is “prithuladhungel@hotmail.com”
To: This field indicates the email address of the receiver of the mail. In the
example, the receiver is “prithula@yahoo.com”
Subject: This gives the subject of the mail (if any specified by the sender). In the
example, the subject specified by the sender is “Test mail”
Date: The date and time when the mail was sent by the sender. In the example,
the sender sent the mail on 19
th
May 2007, at time 23:52:36 GMT.
Mime-version: MIME version used for the mail. In the example, it is 1.0.
Content-type: The type of content in the body of the mail message. In the example,
it is “text/html”.
Return-Path: This specifies the email address to which the mail will be sent if the
receiver of this mail wants to reply to the sender. This is also used by the sender’s
mail server for bouncing back undeliverable mail messages of mailer-daemon
error messages. In the example, the return path is
“prithuladhungel@hotmail.com”.
18. With download and delete, after a user retrieves its messages from a POP server,
the messages are deleted. This poses a problem for the nomadic user, who may
want to access the messages from many different machines (office PC, home PC,
etc.). In the download and keep configuration, messages are not deleted after the
user retrieves the messages. This can also be inconvenient, as each time the user
retrieves the stored messages from a new machine, all of non-deleted messages
will be transferred to the new machine (including very old messages).
19. Yes an organization’s mail server and Web server can have the same alias for a
host name. The MX record is used to map the mail server’s host name to its IP
address.
20. It is not necessary that Bob will also provide chunks to Alice. Alice has to be in
the top 4 neighbors of Bob for Bob to send out chunks to her; this might not occur
even if Alice is provides chunks to Bob throughout a 30-second interval.
21. Alice will get her first chunk as a result of she being selected by one of her
neighbors as a result of an “optimistic unchoke,” for sending out chunks to her.
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