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Spam Filters

You can block an e-mail using spam filters. There are many definitions of spam, but one particularly useful one is the following:

Spam is the electronic version of junk mail, and has been around since the Internet was created. E-mail filters are a way of filtering your e-mail to remove unwanted mail based on a variety of criteria. You can block any sort of e-mail, not just mail of a commercial nature. Blocked mail can be deleted automatically or sent to another e-mail address or script. These filters are quite flexible - some examples are provided after the instruction on how to add a spam filter below. All filters are cumulative.

 

Useful spam links:

Also refer to Spam Assassin for another approach to dealing with spam.

 

To add an e-mail filter:

  1. Click on the E-mail Filtering link in the Mail area.

  2. Click on the Add Filter link.

  3. Click on the required header field in the first drop-down list. These are the various fields in any e-mail message.

  4. Click on the required filter action in the second drop-down list. This action will act on the text entered in the third field.

    • equals - match the text exactly (whole words only). "Credit" will block "Credit".

    • matches regex - matches the text based on regular expression (regex) rules. Regular expressions are a powerful but complex area. You do not need to use regular expression filters for most circumstances. Refer to these two good introductory tutorials - Using Regular Expressions and Learning to Use Regular Expressions - for more information.

    • contains - match the specified text in any circumstance. "badword" will block "badwords" and "badwordbad".

    • begins with - match the specified text when it is the beginning of a word. "badword" will block "badword" and "badwords" but not "badwordbad".

  5. Enter the filter text in the third field. This text is case sensitive.

  6. Enter the destination for the filtered e-mail in the Destination field. There are three separate types of destination:

    • Destroy the e-mail - Enter Discard in the field.

    • Redirect to another address - Enter the e-mail address to which to redirect the e-mail.

    • Redirect to a script - Enter the full script path on the machine that hosts your web site.

  7. Click on the Activate button.

Example:

  • To redirect all e-mail from "john@paradise.net", enter: From, equals, john@paradise.net, david@corse.org.nz

  • To delete all e-mail from paradise.net, enter: From, contains, paradise.net, Discard

  • To delete all references to badword, enter: Any Header, contains, badword, Discard

  • To discard all e-mail that Spam Assassin has marked as spam, enter: SpamAssassin Spam Header, begins with, yes, Discard

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