Configuring Spam Filter

According to some studies, spam or junk email messages are the worst thing happening in the Internet. We provide several ways to reduce the volume of spam you need to deal with every day.

To configure spam filter, you need to log on to your webmail. Please see the section called “Checking Email Using Webmail” for more information about webmail. Inside webmail, then go to Options and then Spam Filter.

Inside you can choose how would you like to combat spam. There are several level of spam protection you can use, each with its own weakness and strength. The levels of spam protection are described below.

  • Level 0: Spam protection disabled. When using this level, spam protection is disabled. You will receive spam along with your legitimate email messages.

  • Level 1: Common keyword analysis. Our system will analyze incoming email for certain keywords. If the number of keywords found reaches a certain threshold, our system will treat the email as spam and deliver it to Junk Mail folder.

  • Level 2: Spam learning system. You tell our system which email messages are spam and which ones are not. Our system will then attempt to identify spam based on your input.

  • Level 3: Challenge and response system.. Our system will keep record of all legitimate senders. Any unknown senders will need to confirm themselves in order to send you email messages.

More information about each level is described on the following sections.

Spam Protection Level 1

With this level active, you don't need to anything else. Any identified junk email messages will be delivered to your Junk Mail folder. This method however is not as effective as the other levels of spam protection. When using this level, it is better if you check your Junk Mail folder for legitimate email messages that get misclassified.

Spam Protection Level 2

When using this level, you will need to get a bit involved with spam filter. This level of protection requires your feedback, you need to tell our spam filter which messages are junk email messages and which ones are not. There are several ways to accomplish this.


Flagging messages as spam or not spam will still work if this level of spam filter is not active. However our system will not use this information to classify incoming email messages.

  • From mailbox view (the view that comes up when you click INBOX or other folders) where you can select using the checkboxes on the left of each of message. Check all email messages that are spam/not spam and then click Spam or Not Spam, respectively.

  • From email view (the view that comes up when you click on an email message). Click spam or not spam depending on the legitimacy of the message.


Any email messages that marked as spam will be automatically moved to your Junk Mail folder

You will need a sizable amount (1000+) of learned email messages before the filter becomes effective. But when it becomes effective, it is very effective when filtering spam.


You need to identify both spam and non spam email messages you receive. Identifying only spam messages is not enough.

Spam Protection Level 3

This level of spam protection requires active participation from both you and the other party of email communication. This level of spam filter combines several countermeasures such as whitelists, blacklists and challenge and response. Spam protection level 3 should be very effective, however it requires your active participation and a bit knowledge on how the system works. On some cases it will also require your peers to answer challenge sent to them.


You need to understand how the system works before using spam filter level 3. Failing to understand could result in loss of email messages.

When this level is active, every email destined for you will subject to whitelists and blacklists. If the sender's email address is in your whitelist, the message will be delivered to you. On the other hand, if the sender's email address is in your blacklist, the message will be bounced back. If the sender's email address is not listed on either your whitelist or blacklist, then our email system will send a challenge to the sender, if he/she replies the challenge then the message in question will be delivered to you and he/she will be added to your whitelist, so that he/she won't have to get challenged again when sending you another email in the future.


When subscribing to a Yahoogroups! or an ezmlm based mailing list, you need to whitelist its extension address. For example, if you want to subscribe an ezmlm mailing list, you will need to whitelist list-*

You can also edit your whitelist and blacklist manually. From inside webmail, go to Options and then Whitelist and Blacklist Management. Inside, you will be able to add email address to or remove existing ones from your whitelists and blacklists. You can also use wildcards to specify multiple address, here are some common examples.

  • * will match but not

  • *@* will match but not

  • * will match both and

By using spam filter level 3, in addition of the main email address (i.e. you can also use extension addresses. There are several types of extension addresses.

  • Dated Addresses. Our system can automatically tag your message with a temporary email address which only works for a defined time internal (e.g. one week). During this period, even those not on your whitelist will be able to contact you using the dated address. An example of a dated address is, this particular address can only be used to send you email unchallenged before 18 September 2003.

  • Sender Addresses. Sender address is an email address that only a certain sender can use to send you email. An example of a sender address is This address will only accept messages from unchallenged. Other messages must go through the confirmation process.

  • Keyword Addresses. Keyword address is a special address which will work for any sender and indefinitely unless specifically revoked. Any string can be used as the keyword. An example of a keyword address is, the keyword of this address is 'amazon'. Keyword address are useful when you need to give your address to another party but can't predict beforehand the sendier address that will be used to send you email. For example, you can use keyword address for signing up to Amazon or eBay. If you later find out that Amazon misuse your address, you can revoke this address by blacklisting the keyword address.

When composing email and spam filter level 3 is enabled, you have the option to use extension address. This way, the 'from' field of your email message is replaced by your extension address.


By default, if you send an email to an address that hasn't whitelisted yet, that address will be whitelisted automatically to prevent deadlock when communicating with users that using similar system.

You can also generate extension address manually, useful if you need to hand out an email address without sending an email message (e.g. when dealing with a HTML form that asks for your email address). To generate extension address manually, go to Options, then Spam Filter, and then generate extension address.

Copyright © 2003

. .