If you wish to set your own spam filtering option but wonder which option
is the best for you, here is a presentation on the pros and cons of the
|You will not lose any mail and can still make use of the spam-rating scores by setting up your own spam filtering rules in your email client software.||You will see all the spam appearing in your incoming mailbox (inbox). The spam will accumulate and take up disk space in your server. You must spend time to delete the spam to free up the disk space.|
|You will have a relatively clean inbox. You will not lose any email falsely labelled as spam as they can still be retrieved from the spam folders.||If you are concerned that some of your mail might be falsely labelled as spam, you should browse the spam folders to see if there is anything to be salvaged.|
|You will have a cleaner inbox as spam from black-listed spammer sites are rejected before they reach your inbox. Then, all the received email are processed and filtered as in option 2.||You will lose the mails that originate from black-listed spam sites. If you have any such concerns that certain emails you are waiting for may come from a black-listed site, you should not choose this option.|
The temporary spam folders will be named as "spam-of-YYYYMM", where YYYY and MM are the year and month in which the spam messages are saved. These temporary spam folders will be deleted automatically by the system one month after their creation month i.e. the folder "spam-of-200401" created in January 2004 will be deleted on March 1, 2004.http://www.spamassassin.org/tests.html
Each time a feature is tested positive by the spam filtering program, an "s" is added to the spam score. You can see this spam score in the full header of that message e.g. "X-MailScanner-SpamScore: sssssssssssssss". The more s's in the spam score, the more likely this is a spam. The default spam score threshold set by Computer Centre is 5 . This means that all emails having a spam score equal to or greater than 5 s's will be filtered out and put in a spam folder. You can set the spam score threshold yourself ranging from 1 to 9. Please note that if a smaller threshold number is selected, more emails would be labelled as spam.
To find out how to reveal the full header of a message, see http://www.spamcop.net/fom-serve/cache/19.html
While the Aggressive option filters out more spam than the Basic option, you will miss those mails coming from black-listed spammer sites. If you have such concerns, it is better to select the "Basic Filter".
For other concerns you may have regarding the spam filtering service provided by Computer Centre , please refer to our Frequently Asked Questions on Spam Filters at http://www.its.hku.hk/faq/stopspam.htm