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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.
Also refer to Spam Assassin for another approach to dealing with spam.
To add an e-mail filter:
- Click on the E-mail Filtering link in the Mail area.
- Click on the Add Filter link.
- Click on the required header field in the first drop-down list. These
are the various fields in any e-mail message. - 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.contains - match the specified text in any circumstance. "porn" will block "porn" and "pornography". begins with - match the specified text when it is the beginning of a word. "porn" will
block "porn" and "pornography" but not "oldporn". - Enter the filter text in the third field. This text is case sensitive.
- 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. - Click on the Activate button.
Example:
 | To redirect all e-mail from "john@somedomainnamezparadise.net", enter: From, equals, john@somedomainnamezparadise.net |
| To delete all e-mail from somedomainnamezparadise.net, enter: From, contains, somedomainnamezparadise.net, Discard |
| To delete all references to pornography, enter: Any Header, contains, porn, 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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