Email has evolved significantly since its invention in the 1960s. It started as a simple messaging system but grew to become the "killer app" of the internet due to its low cost, ease of use, and ability to be accessed from any device with connectivity. Key developments like SMTP, POP, IMAP, and MIME have allowed email to support attachments, non-text content, and interoperability across different service providers and devices. However, the openness of email has also enabled issues like spam and potential security risks to emerge.

1. Higher-level Internet Protocols:
Making the Internet Work
Lacanilao, Olvida, Sevilleja

2.  a system for sending messages from one
individual to another via telecommunications
links between computers or terminals using
dedicated software (Dictionary.com)
 More than 3.8 billion email users in 2018. To
reach 4.2 billion in 2022. (Radicati Group Inc.,
2018)
EMAIL

3.  Invented by Ray Tomlinson in 1960’s
with limited use.
 ‘STORE – AND – FORWARD’ model.
 Email was a generic term for any
electronically transmitted documents.
 Fax
EMAIL

4.  Has existed since BITNET
 Was given a title of “Killer App” of the
Internet
 Was seen as a ‘not so high-tech’, but ironically
is being passed through generations
 Too slow and not spontaneous
 SPAM
EMAIL

5.  In 2018, 52% of e-mail users see spam as on of the
major problems in the internet.
 14.5 billion spam messages per day are being sent
globally, 45% of all e-mails being sent daily.
 36% are advertising-related, 31% are adult-related, 26%
are related to financial stability and freedom.
 USA is the number one contributor of SPAM e-mails,
number two is Korea.
SPAM

6. Email is used by (almost)
everybody.
 Half of the population in 2018 are e-
mail users.
 Users have an average of ~2 active
email accounts in 2018 (Radicati, 2018)
EMAIL AS THE ‘KILLER APP’

7.  Email is adaptable and dynamic.
 Users can easily customize, personalize, and
sort their emails and the contents that they
are receiving.
Recent internet searches
Location
Latest purchases
EMAIL AS THE ‘KILLER APP’

8.  Email is mobile friendly
 Early access to electronic mail was often through a
shell account on a mainframe or other large-scale
computer, which was not a very user-friendly
environment. (Miller, 2014)
 Email services now have Web-based interface
 Hotmail, Outlook, YahooMail, Gmail
 Transitioned to mobile apps
EMAIL AS THE KILLER APP

9. Email is cheap.
EMAIL AS THE ‘KILLER APP’

10. Simple Mail Transfer Protocol
(SMTP)
Post Office Protocol (POP)
Internet Message Access Protocol
(IMAP)
EMAIL PROTOCOLS

11.  the standard protocol for email services on a
TCP/IP network.
 provides the ability to send and receive email
messages.
 provides a set of codes that simplify the
communication of email messages between email
servers.
 IETF standardized the codes so that it may be
recognized by other systems.
Simple Mail Transfer Protocol (SMTP)

12. Components:
 Mail User Agent (MUA)
 Mail Submission Agent (MSA)
 Mail Transfer Agent (MTA)
 Mail Delivery Agent (MDA)
Simple Mail Transfer Protocol (SMTP)

13.  Designed to transmit ASCII text data only
 wasn't able to handle fonts, graphics, attachments,
etc.
 Different encoding schemes are needed to
allow for attachments of binary files
 Multipurpose Internet Mail Extensions (MIME)
 UUENCODE
Simple Mail Transfer Protocol (SMTP)

14. Unix – to – Unix code/coding
Forwarding a binary file via email
might cause it to be corrupted.
Largely replaced by MIME
UUENCODE

15.  an Internet standard that helps extend the
limited capabilities of email by allowing
insertion of images, sounds and text in a
message.
 extends the format of email to support non-
ASCII characters, attachments other than text
format, and message bodies which contain
multiple parts.
Multipurpose Internet Mail
Extensions (MIME)

16.  Features offered by MIME
 Support for multiple attachments in a single message
 Support for non-ASCII characters
 Support for layouts, fonts and colors which are
categorized as rich text.
 Support for attachments which may contain executable
files, audio, images and video files, etc.
 Support for unlimited message length.
Multipurpose Internet Mail
Extensions (MIME)

17.  Since the scheme allows users to
exchange data in all formats, it can also
allow easy dissemination of viruses,
Worms, Trojans, and other malwares.
Multipurpose Internet Mail
Extensions (MIME)

18.  a type of computer networking and
Internet standard protocol that extracts
and retrieves email from a remote mail
server for access by the host machine.
 POP3 clients connect, retrieve all messages,
store them on the client computer, and
finally delete them from the server.
Post Office Protocol (POP)

19.  an Internet standard protocol used by email
clients to retrieve email messages from a mail
server over a TCP/IP connection.
 designed with the goal of permitting complete
management of an email box by multiple email
clients, therefore clients generally leave messages
on the server until the user explicitly deletes them.
Internet Message Access Protocol
(IMAP)

20.  For librarians, email provides options for
reference service, interlibrary loan requests,
and professional development.
 For early users, discussion groups and
communities emerged as they used email to
share ideas, questions, and answers to one
another.
EMAIL TECHNOLOGY AND ITS
APPLICATION

21.  a collection of user-submitted notes or
messages on various subjects that are
posted to servers on a worldwide
network.
 Each subject collection of posted notes
is known as a newsgroup.
 LISTSERV and majordomo are some hosting
sites
USENET