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A3 Printing Support Available

The Fast Printing Service has been well-received since its launch on 31 January 2007 (please see "Guideline for Fast Network Printing Service" for details.) In view of the need for A3 Black & White and A3 Colour printouts, we are glad to announce that the Fast Printing Service also supports them with immediate effect. Users may simply set the document size to A3 for A3 printouts, and to simplify the calculation, we will maintain both A4 and A3 printing at the same rates for the moment. The charging rates for the Fast Printing Service may be adjusted in future reviews to reflect the updated operation costs if necessary.

Relocation of Express Printing Service and Fast Printing Service

In order to improve the working environment at the CSC Student Terminal Area, the Express Printing Service located along the main corridor of the CSC has been moved to the new Printing and Plotting Room situated between Teaching Studios B and D, while the Fast Printing Service has been relocated to the area outside Teaching Studio G.

Illegal Storing or Sharing Activities of Copyrighted Materials – Your Personal Liability

The entire CityU community is reminded of the University's commitment to the protection of intellectual property and copyrighted material. When it comes to illegal storing or sharing of digital materials - whether music, video, text, or picture - the University imposes its own penalties (disciplinary action, loss of network connectivity) on anyone who is found to be using CityU facilities or campus network for such purposes.

Moreover, organisations hired by the copyright owners are aggressively searching for copyright violators on the Internet and will take independent legal action against such violators. Peer-to-peer file sharing activity using the campus network is easily subject to their scrutiny as long as they remain as one of the participants. Many past legal actions by these organisations have resulted in successful imposition of substantial monetary penalties on the violators.

Please be aware that the target of these actions is not only the individuals engaged in the violations but also the University if it has not shown its diligence in curbing these violations being carried out on its computers or network. As an Internet service provider, the University has no way to prevent but to be obliged without delay to cooperate fully with any law enforcement agency requesting the names of individuals who use computers to share copyrighted materials illegally.

As such, users who use their accounts on the University facilities for such activity inevitably expose both themselves and potentially the University to legal action. Therefore, to protect yourself and the University, make sure you will not engage in illegal storing or sharing of copyrighted materials.

Please Tell Us If You No Longer Need a Booked CSC Teaching Studio

The teaching studios in the Computing Services Centre (CSC) have always been under great demands. For better uses of University resources and for benefits of those staff and students who may still wait for these rooms, as soon as you know that you no longer need the booked CSC teaching studio, please kindly cancel your booking through the CSC Teaching Studio Booking System or through our staff at the Service Counter in the CSC Terminal Areas at least one day in advance. If you have any enquiries, please contact the CSC Service Counter.

 
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Got any questions, comments or suggestions? Contact the editors at ccnetcom@cityu.edu.hk
 
Issue 37 - Sep 2003
Email Spamming
By Clevin Wong

What is "spam"?

"Spam" can be regarded as a synonym of "junk mail". It refers to unsolicited commercial email (UCE) and unsolicited bulk email (UBE). Email spam is an annoying problem faced by most of the email users on the Internet. No one wants his/her mailbox fills up with unwanted messages. However, spam spreads everywhere on the Internet nowadays, we get it almost every day and the condition is getting worse.

Senders of spam are known as "spammers". They send spam to advertise products/services and recruit victims for scams. The following are some common examples of spam:

  • "Get rich quick" or "make money fast" schemes
  • Foreign bank scams or advance fee fraud schemes
  • Pyramid schemes, including multilevel marketing
  • Offers of mortgage loans
  • Offers of credit reparation
  • Offers of software or service for collecting email addresses and sending spam
  • Scams on health products and remedies
  • Offers of illegally pirated software
  • Chain letters
  • Pornographic materials
  • Unsolicited political materials
  • Others types of unsolicited commercial advertisements


How can spammers get my email address?

It is really an unhappy experience to find your mailbox filled up with spam. Most victims of spam will ask "how can spammers get my email address?" Spammers collect email addresses in many ways. For example, they regularly use some search engines to harvest email addresses automatically from web pages, newsgroups, bulletin boards, directory services ... on the Internet. They may generate random sequences of characters, hoping to match a few valid addresses. They can buy email addresses from other spammers. Moreover, sometimes people may be required to submit their email addresses on the Internet (e.g. before downloading some software), and these addresses may be released to unknown persons.

In order to avoid spamming, you are advised to safeguard your email address. For example, you should not disclose your email address when filling questionnaires from unknown organizations.


What should I do when I receive spam?

First of all, you should never buy/use/enquire any products and services advertised in the spam. Otherwise, you will encourage more spamming and you may become one of the victims for scams (please refer to http://www.ftc.gov/bcp/conline/pubs/alerts/doznalrt.htm for the most common scams in spam).

You should not open any files attached with the spam, because these files may contain computer virus or indecent material. You should avoid clicking any links (including the "click here to unsubscribe" links) or pictures in the spam, because spammers may use these links to verify that your email address is active. You should not send replies or "remove me" messages to the spammers because this will also inform them your email address is active. Once they know your email address is active, they may send more spam to you and give your address to other spammers.

Besides deleting the spam manually, you can set up client-side email filters in your email clients to file/delete the spam mail automatically (please refer to http://email.cityu.edu.hk/faq/filteremail.htm for the detailed procedure). Moreover, you can directly complain to the site administrator if you know the actual originating site of the spam. Or, you can report the case to CSC using the email address spamrpt@cityu.edu.hk.


What has CSC done to reduce spam?

Up to now, there is no perfect solution to completely stop all spam. The following are some of the major difficulties:

  • The sender address of the spam may be fictitious. Spammers can fake any sender addresses.

  • Spammers can employ the "hit and run" strategy. They create ac-hoc accounts solely for sending spam and send the spam from different network locations.

  • Some Internet Service Providers do not response to complaints of spamming from their customers.

  • Automatic identification of spam mail is complex and difficult. Unlike virus scanning that can use exact pattern matching; there is no exact pattern for spam. Moreover, in order to avoid being identified as spam, spammers may use special software to disguise the spam by sophisticated techniques: generating spam with dynamic subjects and contents; using non-English character set; misspelling some keywords by intention; displaying the messages as graphics; scrambling the message source with HTML comments ... etc.
In order to reduce spam, the Computing Services Centre (CSC) has implemented the following mechanisms:
  • All our email servers have installed with anti-relaying control to prevent them from being used by non-CityU machines for sending spam.

  • We have made use of the some well-known public databases to block email connections from black-listed spamming sites.

  • We have implemented control scheme to detect spam automatically by traffic volume. The sender sites will be blocked automatically once the predefined volume threshold is exceeded.

  • Sometimes the spam may come with virus-infected attachments. To protect our users, we have installed virus-scanners on the mail servers to scan all email messages automatically.

  • We have created a special email account spamrpt@cityu.edu.hk to receive spam reports from our users. Mailing sources that are frequently found sending spam will be blocked.

  • We have developed a web-interface for users to setup their server-side mail filters. Server-side filters are usually more efficient than client-side filters. A pilot-run of this utility will be launched in the near future.

Besides the above, we are evaluating different hardware and software technologies on anti-spamming. We also keep on exploring more effective ways of dealing with spam including experience sharing among experts in this field and in academic institutes.

Also in this issue...
Video Conferencing: Now a Much Easier Option
CKC Chinese Input System is Available at CityU
You Can Make a Difference in Virus Prevention
Computer Ownership Programme 2003
Maintenance Arrangement for Desktop and Notebook PCs



 

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