WebmailWebmail

AgendaAgenda

Why use webmail?Why use webmail? What is webmailWhat is webmail

– Email basicEmail basic» Email systemEmail system

MDAMDA MTAMTA MUAMUA

» ProtocolProtocol SMTPSMTP POP3POP3 IMAPIMAP

AgendaAgenda

– Webmail systemWebmail system» structurestructure

» Vs email systemVs email system

» Example TWIG, SquirreMailExample TWIG, SquirreMail

DemoDemo

Why use webmail?Why use webmail?

Common interfaceCommon interface– Resources for training are littleResources for training are little

Machine independent Machine independent – Only browser is neededOnly browser is needed

Why use webmail?Why use webmail?

Mobility and easy to useMobility and easy to use– Can use any place that connect internet Can use any place that connect internet – Only need a browser and a account Only need a browser and a account – No setting neededNo setting needed

Email systemEmail system

MDA ( Mail Delivery Agent) MDA ( Mail Delivery Agent)

concentrate on delivering mail to local usersconcentrate on delivering mail to local users» Just like what postman doJust like what postman do

e.g. Binmail, Procmaile.g. Binmail, Procmail

Email systemEmail system

MTA ( Mail Transfer Agent)MTA ( Mail Transfer Agent)

determines destination of recipient determines destination of recipient address and transfer the mailaddress and transfer the mail

» just like the post officejust like the post office

e.g. sendmail, qmail, Postfixe.g. sendmail, qmail, Postfix

Email systemEmail system

MUA ( Mail User Agent )MUA ( Mail User Agent )

as an interface for users to read as an interface for users to read messages stored in their mail boxmessages stored in their mail box

» just like your hand and footjust like your hand and foot

» This is machine dependant programThis is machine dependant program

e.g. kmail (linux), outlook express ( windows)e.g. kmail (linux), outlook express ( windows)

What is webmailWhat is webmail

Email basicEmail basic– Email systemEmail system

Workstation

MUA

Mail Server

MTA

Email database

Mail Server

MTA

Email database

MDA MDA

Workstation

MUA

POP3/IMAP

SMTP

SMTP

ProtocolProtocol

SMTP ( Simple Mail Transfer Protocol)SMTP ( Simple Mail Transfer Protocol)

– Protocol used in MTA Protocol used in MTA – Developed for transferring messages across Developed for transferring messages across

Internet between MTA servers.Internet between MTA servers.

ProtocolProtocol

POP3 (Post Office Protocol)POP3 (Post Office Protocol)– Simplest MUA protocolSimplest MUA protocol

– Current version of POP is 3 -> POP3Current version of POP is 3 -> POP3

– MUA use POP3 to access and read messages in user’s MUA use POP3 to access and read messages in user’s mailbox mailbox

– Messages will store on local workstation, and deletes Messages will store on local workstation, and deletes messages from server, thus save space on mail servermessages from server, thus save space on mail server

ProtocolProtocol

IMAP(Interactive Mail Access Protocol)IMAP(Interactive Mail Access Protocol)

– MUA protocolMUA protocol– Current version 4, revision 1 -> Current version 4, revision 1 -> IMAP4rev1IMAP4rev1– MUA use it to manipulate mail messages in MUA use it to manipulate mail messages in

folders on the mail serverfolders on the mail server

ProtocolProtocol

IMAP(Interactive Mail Access Protocol)IMAP(Interactive Mail Access Protocol)

– Messages keep in mail server -> can access in Messages keep in mail server -> can access in different workstationdifferent workstation

– Disk space must be watchedDisk space must be watched

Webmail systemWebmail system

StructureStructure

Web server Mail Server

Workstation

Webmail client

browser

MUA

Email database

MTA

Webmail systemWebmail system

Vs email systemVs email system– Only need a web server, so no need to Only need a web server, so no need to

setup on workstationsetup on workstation

Webmail systemWebmail system

Example TWIG, SquirreMailExample TWIG, SquirreMail

DemoDemo