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E-mail 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.
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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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