Post on 31-Jul-2015
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Session 2 eMail Friend or Foe?
It Depends on…
•Your eMail address
•Your password hygiene
•Who is your eMail provider
and what you use it for!
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Introduction
tell you “Click X to do Y“
teach you step-by-step how to send an email/Skype your son/etc
advise you on the best computer
etc…
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Why Not?Because nobody can remember that stuff
It will be different next week
Everyone’s needs are different
“I can’t be bothered with all this medical stuff, show me how to do brain surgery”
These Sessions Will Not:
IntroductionShow you HOW to be comfortable with new technologies
Show you WHY the new ways may be advantageous for you
Help overcome the fear
Accept change
By Explaining the jargon
Introducing the concepts
Getting you to think “Oh, this is like…”
Showing you can’t “break” a computer… usually
These Sessions Will Try to:
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How does “snail mail” work?
It’s “Store and Forward”
Uppingham
Glasgow
Oakham Harboro
Other ISP
Their Broadband
Modem
Your Broadband
Modem
Their ISP
Backbone Network
Your ISP
How does email work?
Domain Name Server
Mail Server
Relay Server
Mail Server
Other ISP
ISP - Internet Service Provider
Your email app
It’s “Store and Forward”
Domain NamesInternational Company for Assignment of Network Names (ICANN) assigns the addresses to Domain Names
• e.g. • google.com • gmail.com • bbc.co.uk • facebook.com
• Registered with ICANN • ANYONE can have a Domain Name
(from £2 - £100000+ a year)
• Each Domain can have lots of Servers
• Each Server can have several Hosts i.e. Apps that provide a service
8 Main St Wing UK LE15 8SE
HQ BBC CO.UK 212.58.246.000
www.bbc.co.uk/iplayer www.bbc.co.uk/sport www.bbc.co.uk/weather
www.bbc.co.uk=212.58.246.129 news.bbc.co.uk=212.58.246.81
Snail Internet
www.bbc.co.uk/news/england
The Internet as a House
Domain Name Server (DNS)
I never use the address for anything, I use a name.
• Your computer goes to a DNS server
• It keeps a list of names and corresponding IP addresses
• It tells your computer what IP address to use
• All devices have a unique address
• like a serial number - the Media Access Code (MAC).
• Usually found on the bottom or back of the device
• Defined by manufacturer • e.g. 7A:79:19:73:D2:05
Media Access Code (MAC)
The Internet has a special networking language - the Internet ProtocolAnyone who wants to use the Internet has to have an address - the Internet Protocol (IP) address
• Google is 31.55.163.183 • The BBC is 212.58.246.104
• First part defined by the Internet Corporation for Assigned Names and Numbers (ICANN) e.g. Google 31, BBC 212 ( for big companies).
• The rest is defined by the requesting company
The Internet
The Internet - a network of computers
So to put a server on the Internet you: 1. buy a Domain name from an ISP
• wingvillagehall.club 2. ISP sends details to ICANN 3. ICANN assigns an IP address
• e.g. wingvillagehall.club has address 65.39.140.84
4. ISP adds name/address pair to its DNS server.
5. DNS entry is propagated around the world to all other DNS servers
Other ISP
Their Broadband
Modem
Your Broadband
Modem
Their ISP
Backbone Network
Your ISP
How does email work?
Domain Name Server
Mail Server
Relay Server
Mail Server
Other ISP
ISP - Internet Service Provider
Your email app
It’s “Store and Forward”
Other ISP
Harry’s Modem
Sally’s Modem
hisisp.com
Backbone Network
yourisp.co.uk
How does email work?
Domain Name Server
Mail Server
Relay Server
Mail Server
Other ISP
ISP - Internet Service Provider
to:harry@hisisp.com
It’s “Store and Forward”
hisisp.comIP Address34.73.46.10
from:sally@yourisp.co.uk
Sally
Harry
34.73.46.10
It’s “Store and Forward” oriented
email AppsClient Apps• installed on your computer• emails STORED on your computer• lose computer, lose emails - unless good backupOutlook Express Outlook Thunderbird Mail …….
Web Apps• Nothing installed on your computer• emails STORED on the ISP server• lose computer, get another one and carry on
Gmail Yahoo Hotmail Many ISP’s own email system …….
Efficient Use of email
• Use folders or labels • Archive emails not delete • Remember
• cc: sends an email to a list of people BUT displays the list to everyone
• bcc: as cc: but HIDES the list. • You cannot email large files such as HD
photos • Use filters to handle repeated emails • Use filters to remove SPAM
What is “Store and Forward”?Data is passed to a server that then saves it until the next server is online and ready until it reaches its destination
“Fire and Forget”
e.g. email
What is “Conversation” mode?
All servers in the path must be working for the request to be sent and the response received.
Is email “safe”?Used properly and with some caution, YES
Used without some thought and care, NO
Rules!1.Use a reputable email providerThey filter out most bad stuff, SPAM, before you see ite.g. xxx@gmail.com yyy@exchange.com zzz@zoho.com
2.Do NOT use a cheap unknown email providere.g. xxx@cheapemail.ru
3.NEVER open an attachment from someone you don't know
4.NEVER give your password to anyone on line or telephone
5.NEVER give credit card details unless it is httpS://xxxxx in the address bar and then ONLY if you recognize the domain
Best option?Buy your own private domain AND use a reputable email provider e.g. john@wingonline.com - my domain but Gmail provider.
Why? Because the bad guys will attack well-known domains because more people are using them. They are unlikely to know your private domain.
More Rules!1.Always install an anti-virus appSet it up to scan at least once a week
AVG Avast
2.Always install an anti-malware appSet it up to scan at least once a week
Malwarebytes
3.Open source apps are FREE and saferOpen source programs are written by enthusiastic nerds who are volunteers and passionate. There will be hundreds of nerds checking the app for anything evil.
An naked email fileMIME-Version: 1.0Sender: john@wingonline.com Sent: by 10.96.9.230 with HTTP; Tue, 3 Feb 2015 11:22:54 -0800 (PST) Date: Tue, 3 Feb 2015 19:22:54 +0000 Deliver: oakleyje@gmail.com Subject: Example email From: John Oakley <john@wingonline.com> To: John Oakley <oakleyje@gmail.com> Content-Type: multipart/alternative; boundary=001a11c1338867c548050e33ff82
--001a11c1338867c548050e33ff82 Content-Type: text/plain; charset=UTF-8
Hello
--001a11c1338867c548050e33ff82 Content-Type: text/html; charset=UTF-8
Hello<div class="gmail_signature"></div>
Your Broadband
GooglePlex
Backbone Network
Your ISP
How does Google work?
Domain Name Server
Mail Server
Relay Server
Search Engines
It’s “Conversation” oriented
Request
Response
The Internet Part 1
Millions of computers interconnected with a common “language”
Questions?About today
Still unanswered
Anything else
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