3) (10 pts) Consider the following sample mail message header. [EMAIL not covere
ID: 3585603 • Letter: 3
Question
3) (10 pts) Consider the following sample mail message header. [EMAIL not covered in Fall 2017 from 65.54.246.203 (EHLO bayo-ome3-s3.bayo.hotmail.com) Received: (65.54.246.203) by mt a419.mail.mud.yahoo.com with SNTP: Sat, 19 May 2007 16:53:51-0700 from hotmail.com 3.bay0.hotmail.com with Microsoft SMTPSVC (6.0.3790.2668): May 2007 16:52:42-0700 from mai1 pickup service by hotmail.com with Microsoft SHTPSVC bayo-oncJ- 19 {65.55.135.106]) by Received: Sat, sate 19 Hay 2007 16240 kicrosofe STPSv Receivedi Message-ID: Received: F romt from 65.55.135.123 by by130fd.bay130.hotmail.man.com with HTTP Sat, 19 May 2007 23:52:36 GHT "prithula dhunge1" prithulagyahoo.com Bce: Subject: Test mail Sat, 19 May 2007 23:52:36 +0000 Mime-Version:1.0 Content-Type:Text/html; format-flowed Return-Path: prithuladhunge1hotpai1.com a) (5pts) In this example there are 4 Received:" header lines. This means the mail message passed through 5 different SMTP servers before being delivered to the receiver's mail box. List these five SMTP servers (name or IP address). Hint: The sender's SMTP server is at address 65.55.125.123.] b) (5pts) Explain each of the header lines in the message? Hint: Pay attention to the time in each of the Received header lines.]Explanation / Answer
The five SMTP SERVERS ARE AS FOLLOWS:
SMTP:65.55.135.123(sender)
SMTP: by130fd.bay130.hotmail.man.com(mail pickup service)
SMTP:65.55.135.106(Hotmail.com)
SMTP:65.54.246.203(bay0-omc3-s3.bay0.hotmail.com)
SMTP: mta419.mail.mud.yahoo.com(recievers mailbox)
Received: The received header field specifies the order in which the SMTP servers send-and-receive the e-mail with the respective timestamps.
As there are 4 "Received:" header_lines. This indicates that mail has passed through 5 different SMTP servers before being delivered to receiver.
The last ,i.e. 4th "Received:" indicates the e-mail message flow from the SMTP server of the sender to the 2nd SMTP server in the server chain. The sender's SMTP server is at the ip-address 65.55.135.123 and the 2nd SMTP server in the chain is by “130fd.bay130.hotmail.msn.com”.
Similiarly, the 3rd,(second last )"Received:" indicates the mail message flow from the 2nd SMTP server in the chain to the 3rd server.
2nd received (third last) indicates mail flow from 3rd SMTP SERVER in the chain to 4th SMTP server
Finally, the first OR top "Received:" indicates the flow of e-mail from the 4th SMTP server to the last or reciever’s SMTP SERVER i.e. recievers mail box
Message-id: here number BAY130- F26D9E35BF59E0D18A819AFB9310@phx.gbl (by bay0-omc3-s3.bay0.hotmail.com.. is the message –id which is always unique and generated by mailing system to uniquely identify each mail message when created.
From: This specifies the sender’s email address Here "prithuladhungel@hotmail.com"
To: This field specifies the mail-address of the receiver. Here receiver is "prithula@yahoo.com"
Subject: This specifies the subject of the e-mail (if any given by the sender). here, the subject mentioned by the sender is "Test mail"
Date: The date and time when the mail was received by the reciever. Here 19th May 2007, at time 23:52:36 GMT.
Mime-version: Multipurpose Internet Mail Extensions (MIME) is the internet-stsandard that extends the email format to support:
· Text in characters other than ASCII
· Non-textual attachments like: audios, videos, image, etc.
MIME_version used for the mail is 1.0 here.
Content-type: The content type in the body of the e-mail. Here,"text/html".
Return-Path: This indicates the path through which the email will be returned in case the receiver replies the mail.Also in case of any error in message delivery this path will be used to bounce back the message to the sender . Here the return_path is "prithuladhungel@hotmail.com".
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