P E-Mail Protocols

7/29/2019 P E-Mail Protocols

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Copyright © 2005::FIT ( www.fit.ba ) 1

Fakultet informacijskih tehnologija

Predmetni nastavnik: prof. Lada Buturović

Demonstrator: Iris Memić ([email protected])

Udžbenik: Oxford English for Information Technologyby Eric H. Gledinning & John McEwan

WORLD WIDE WEB (part II)

Task 1 Read the following text

E-MAIL PROTOCOLS

Although the format of a mail message, as transmitted from one machine to another, is

rigidly defined, different mail protocols transfer and store messages in slightly differentways. The mail system you're probably used to employs a combination of SMTP and

POP3 to send and receive mail respectively. Others may use IMAP4 to retrieve mail,especially where bandwidth is limited or expensive.

Simple Mail Transfer ProtocolSMTP is used to transfer messages between one mail server and another. It's also used

by email programs on PCs to send mail to the server. SMTP is very straightforward,

providing only facilities to deliver messages to one or more recipients in batch mode.Once a message has been delivered, it can't be recalled or cancelled. It's also deleted

from the sending server once it's been delivered. SMTP uses 'push' operation, meaningthat the connection is initiated by the sending server rather than the receiver. This

makes it unsuitable for delivering messages to desktop PCs, which aren't guaranteed to

be switched on at all times.In host-based mail systems, such as Unix and Web mail, SMTP is the only protocol theserver uses. Received messages are stored locally and retrieved from the local file

system by the email program. In the case of Web mail, the message is then translated

into HTML and transmitted to your browser. SMTP is the only protocol for transferring

messages between servers. How they're then stored varies from system to system.Post Office ProtocolPOP is a message retrieval protocol used by many PC mail clients to get messages from

a server, typically your ISP's mail server. It only allows you to download all messages inyour mailbox at once. It works in 'pull' mode, the receiving PC initiating the connection.

PC-based POP3 mail clients can do this automatically at a preset interval. When you useyour Web mail account to access a POP3 mailbox, the mail server opens a connection to

the POP3 server just as a PC-based application would. The messages are then copiedinto your Web mailbox and read via a browser.

Since POP3 downloads all the messages in your mailbox, there's an option to leave

messages on the server, so that they can be picked up from different machines withoutlosing any.



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This does mean that you'll get every message downloaded every time you connect to

the server. If you don't clean out your mailbox regularly, this could mean longdownloads. When using a Web mail account to retrieve POP3 mail, be careful about

leaving messages on the server - if too many build up, each download will take a long

time and fill up your inbox. Many Web mail systems won't recognize messages you'vealready downloaded, so you'll get duplicates of ones you haven't deleted.

Internet Mail Access ProtocolIMAP is similar in operation to POP, but allows you more choice over what messages

you download. Initially, only message headers are retrieved, giving information about

the sender and subject. You can then download just those messages you want to read.

You can also delete individual messages from the server, and some IMAP4 servers letyou organize your mail into folders. This makes download times shorter and there's nodanger of losing messages.



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Task 2 Find the answers to these questions in the previous text:

1. Name three different email protocols mentioned in the text.

2. Which email protocol is used to transfer messages between server

computers?

3. Why is SMTP unsuitable for delivering messages to desktop PCs?

4. Name two host-based mail systems mentioned in the text.

5. Where are email messages stored in an SMTP system?

6. What happens when you use your Web mail account to access a POP3

mailbox?

7. Give an advantage and a disadvantage of having an option to leave

POP3 messages on the server.

8. What are the advantages of using the IMAP4 protocol?

Task 3

I Match the terms in Table A with the statements in Table B.

Table A

a SMPTb “Push” operation

c POP

d “Pull” operatione IMAP

Table B

i An email transfer process in which the

connection is initiated by the sendingcomputer rather than the receiving computer.

ii A mail transfer protocol that initially onlyretrieves the message headers.

iii An email transfer process in which the

receiving computer initiates the connection.

iv A simple mail transfer protocol that is used to

send messages between servers.v A message-retrieval protocol that downloads

all email messages at the same time.



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II Mark the following statements as True or False:

a. Different mail systems transfer emails in different ways.

b. IMAP4 requires more bandwidth than the other email protocols.

c. SMTP is used for sending emails from a PC to a server.

d. SMTP delivers messages one at a time.

e. SMTP does not allow a delivered message to be cancelled.

f. SMTP is only one of many protocols used to send mail between servers.

g. POP protocol allows the user to download one message at a time.



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GRAMMAR & VOCABULARY WORK

Multi-word verbs are made up of a verb, an adverb and a preposition. Because theyend with a preposition, multi-word verbs always take a direct object. Also, the three

words that combine to form multi-word verbs cannot be separated.

I have selected ten multi-word verbs, which are defined below. You will see that, aswith many phrasal verbs, some of the multi-word verbs can have more than one

meaning.

Catch up on/with somethingto do something you did not have time to do earlier

• I'm hoping to catch up on some sleep.

• I need a couple of days in the office to catch up w ith my paperwork.

Come up with something

- to think of or to suggest a plan or idea, a solution to a problem, or an answer to a

question

• A team of advertisers is hard at work trying to come up with a slogan for the

product.

• Experts have failed to come up with an explanation of why the explosionhappened.

- to get or produce something which someone needs or which they have asked you for

• Each member of the expedition needs to come up with £3,000 to fund their trip.

• We need someone to create a new software program.

• Can Bob come up w ith the goods? (= create what we want)

Do away with something

to get rid of something, or to stop using something

• These ridiculous rules and regulations should have been done away with years

ago.

Do away with somebody (informal)

to kill someone

• I tried to do away with myself but I couldn't. [often reflexive]



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Get on to something

- to start talking about a subject after discussing something else

• It didn't take long before we got on to the subject of babies.

• How did we get on to that subject?

- to be elected as a member of an organization

• Taylor has threatened to resign if she gets on to the committee.

- if someone gets on to the television or radio, they are invited to appear or speak on

the television or radio

• He got on to local radio with the story.

Get on to somebody- to speak or write to a person or organization, especially because you want them to

help you in some way

• We'd better get on to a plumber about that leak in the bathroom.• Did you get on to the passport office?

- if someone in authority gets on to you, they find out about something that you have

done that you were trying to keep secret

• It only took a couple of months before the Immigration Office got on to her.

Keep on at somebodyto talk to someone about something many times, usually because you want to complain

about something they have done or not done

• I wish she wouldn't keep on at me, it's not my fault.

• He keeps on at me about the kind of clothes I wear. [often + about]

• The boss keeps on at me to sort out the filing system. [sometimes + to do

something]

Look out for somebody/something

to carefully watch the people or things around you so that you will notice a particularperson or thing

• Remember to look out for Anna - she said she'd be there.

• Can you look out for a present for Ed while you're out shopping?



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Look out for somebody

to take care of someone and do what will be best for them

• I come from a large family and we all look out for each other.

• Tom just looks out for himself. (= he only does what will be good for himself)[often reflexive]

Put up with somebody/something

to accept unpleasant behaviour or an unpleasant situation, even though you do not likeit

• He's not easy to live with - I think Jo puts up with a lot.

• I can put up with a house being untidy but I don't like it to be dirty.

• He's impossible! How do you put up with him?

Run up against something

if you run up against problems or difficulties, you begin to experience them

• The community scheme has run up against local opposition.

Stand up for something/somebodyto defend something that you believe is important [e.g. principle, right], or to defend a

person who is being criticized

• She always stands up for what she believes in.

• The Prime Minister has promised to stand up for British interests abroad.• You've got to stand up for yourself if you want people to respect you. [often

reflexive]

Watch out for something

to be careful to notice something, especially something that might cause you problems

• Drivers were told to watch out for black ice on the road.• Vegetarians should watch out for animal fat in biscuits.

Watch out for somebody/somethingto be careful to notice someone or something interesting

• Watch out for his latest movie which comes out next month.

• Tony Pritchard should be running in this race so watch out for him.



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EXERCISE:

At the top are 15 multi-word verbs. Below are sentences with gaps. Put the correct

multi-word verb (which is already in the appropriate form) into each sentence.

do away with stood up for came up with get on to

looked out for keep on at come up with getting on to

did away with looking out for run up against catch up on

got on to watch out for put up with

1. Sarah missed a week of school and so had to ________________ her work.

2. They simply cannot ________________ a solution to the problem.

3. He finally ________________ the money he needed at the last moment.

4. Let’s ________________ all these silly rules – they are slowing us down.

5. The gangster ________________ his enemies one by one.

6. We finally ________________ the subject that we all met to talk about.

7. I plan to ________________ the committee at the next elections.

8. I’ll be ________________ you next week to ask you a favour.

9. I don’t mean to ________________ you about it, but it’s really important.

10. Even though I was ________________ her, I still didn’t see her.

11. Our family has always ________________ each other and that’s why we likeand trust each other so much.

12. I don’t think that I can ________________ his complaining for much longer.

13. We’ve ______________ a serious problem and cannot continue until we solve it.

14. He ________________ his principles and resigned from the party.

15. You be careful when driving - ________________ animals crossing the road.

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