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Cpanel Tutorials
| What is Email Filtering? |
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:
- 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. 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. "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 "teenporn".
- 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@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 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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