Waypoint
Spam Filtering
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Overview
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Everyone
who has had an email address knows how difficult dealing with
junk email or “spam” can be. Current industry estimates show
that spam mail can account for up to 60% of the email an Internet
provider receives. Over the years, the people who send this junk
mail have altered the way they send their messages and how those
messages appear in an effort to prevent these messages from being
blocked. To cope with this ever-changing menace, Waypoint has
developed a comprehensive email management system that leaves
you, the customer, in charge of your inbox.
When
your email arrives here at Waypoint, a spam filter automatically
examines it. This filter looks at the message, and assigns a
point value to it based on various traits and keywords which are
common to spam. If the assigned score exceeds the maximum allowed
value, it is routed to your "Spam Mail" inbox. Otherwise
the message is routed into your normal email inbox.
Messages
routed to your "Spam Mail" inbox will be held there
for seven days. This will give you an opportunity to login and
view the spam mail that has been filtered. If a message was filtered
that comes from a legitimate sender from whom you know you want
to receive email from in the future (this is known as a "false
positive"), you have the opportunity to "whitelist"
the sender's address. When a user that is on your whitelist sends
you email, the spam filters subtract 100 points from the message’s
“spam score”, in order to allow it through.
Generally,
our spam filtering software is very precise at identifying junk
mail messages. When Waypoint receives tens of thousands of emails
a day however, it is probable that any filtering software will
misidentify messages. This is called a “false positive” when
legitimate messages are tagged as spam, and a “false negative”
when spam slips through without being tagged. The goal is to
use a filtering level which is aggressive enough to prevent false
negatives, without generating false positives. Since most people
receive legitimate email from the same sources (mailing lists,
friends, and family) then the use of a whitelist can be very helpful
in preventing false positives.
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| Webmail Basics
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Figure
1 shows three items. The first is titled “Mail”. This is your
standard email inbox, and shows the mail you have not yet downloaded
with your email program. WebMail works much like any other email
software, allowing you to read new messages as well as reply, forward,
delete, and compose new mail. You can also download attachments
through WebMail and store them on your computer for later use.
The
second choice is “Spam Mail”. This contains all mail that has been
tagged as spam (it will not be downloaded into your mail client
program).
The
third choice is “SpamAssassin”. This is where you can build your
whitelist of addresses that will never have their messages identified
as spam. You can also change the aggressiveness of your mail filtering
here, as well as toggle some options that advanced users may find
helpful in dealing with spam messages. |
| Spam Mail
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The spam
mail box works just like our standard WebMail. You can select any
message by clicking on either the sender or the subject line. This
will bring up the message in its entirety. If this message was a
false positive, you have an option in the upper right hand corner
to “whitelist” it.

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This
will add the sender of the message to your whitelist, preventing
their messages from being blocked as spam.

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| Managing Your Spam Settings
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Waypoint’s spam filtering is highly
configurable, and with a little work can easily be setup to suit
your tastes. To begin setting up your personal filtering preferences,
click “SpamAssassin” once you’ve logged into WebMail. |
Preferences top

Remember:
After making any change to your preferences, you need to click the
“Apply” button for the change to take effect. |
Spam Filtering Level top
Use the
Spam Filtering Level to adjust how low of a threshold is required
for your message to be marked as spam. Values to the left result
in higher sensitivity, meaning messages must have more characteristics
that are common to spam, which will require a higher point value.
Conversely, values to the right result in lower sensitivity, meaning
messages will require a lower point value. In terms of the numeric
point value that gets assigned to each message, all the way to the
left is 10, while all the way to the right is 1. Generally, the
lower the filter sensitivity, the more messages that will be filtered
and so the more “false positives” you will see. If you lower your
filter sensitivity, it is recommended that you check your spam mail
more often to insure that legitimate messages are not being filtered. |
Reports top
Each message
that’s tagged as spam includes a report. This report contains information
about the tests used to determine that the message was spam, and
the point value that each individual test adds (or subtracts) from
the message. The “Reports” section determines how this report is
included in messages that get filtered as spam. Selecting “Include
report as attachment” will cause the spam report to be shown at
the top of each message in your spam mailbox. Selecting “Put report
into message headers” will cause the report to encapsulated in the
message’s headers, leaving the original message intact. |
Headers top
Modifying message headers is an option that will
probably only be useful to more advanced users. Nothing in this
section should need to be modified for day-to-day use.
Selecting
“Add headers to non-spam messages” will also mark the tests and
score used to determine that a message was not spam. This can be
useful if you are trying to determine the appropriate filtering
level for the mail you receive. Remember that toggling this setting
will cause you to see the filtering information in your regular
email – that information will always be present in your spam email.
“Allow Multiple
Lines In Headers” simply determines whether or not information added
to message headers is all compressed into one non breaking line,
or spans multiple lines. Toggling this on will improve readability
of your message headers.
Selecting “Use Spam Level Header” causes the addition of an “X-Spam-Status”
line to your message header. It will use to the keyboard character
in “Spam Level Character” to represent the point score of the spam
you receive. For example, with this setting toggled and your spam
level character set to “*”, a spam message that scores 6 points
will have a header added that reads “X-Spam-Level: *******”. |
Subject rewrite top
“Subject rewrite”is just what the name implies.
With “Tag Subject Lines” toggled it will add the value in “Subject
Tag” to the beginning of the subject line of each email. For example
if you have “*SPAM*” in the “Subject Tag” section, a spam message
that came in with a subject line of “Try our new product” will become
“*SPAM* Try our new product”. |
Rule Management top
The Rule
Management section is the core of your ability to control who’s
messages get tagged as spam and who’s don’t. You can add and delete
rules for both whitelisting (never tagging as spam) and blacklisting
(always tagging as spam). Generally, blacklisting is only useful
if you receive spam messages from the same email address that consistently
do not get caught by the filtering software.
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Adding and Deleting rules top
Adding rules is fairly straightforward. Simply select the desired
action in the drop down box (“Accept Mail From” or “Reject Mail
From”), add the address you would like the rule to use for the desired
action, and click the “Add Rule” button. For example, selecting
“Accept Mail From” and typing in “support@waypoint.com”
will cause messages from Waypoint Technical Support to never be
tagged as spam.
When
adding addresses for rules to apply to, you can also use wildcards.
Wildcards are represented by the “*” character, and can be thought
of as “anything” or “anyone”. If you had typed in “*@waypoint.com” in the example above, that would
mean that mail sent from any email address at waypoint.com would
not be tagged as spam. Wildcards should be used with caution, as
just using a “*” means that the desired action will be applied to
all email addresses.
To remove
a rule, simply find it in the list and click the “Delete Rule” button
to the right. |
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