Exchange Mail Filtering
Exchange Mail Filtering
Exchange Spam Filtering e-mail is a way of identifying it as spam
while allowing for the opportunity to manually verify the accuracy of
the filtering process. Every e-mail is assigned a numerical value. This
value is referred to as the message's score or, in Microsoft Exchange
terminology, it's Spam Confidence Level (SCL). A rule is set to filter
messages with a score that is above a certain threshold. That rule
identifies the message as possible "junk e-mail" and delivers it to the
Junk E-Mail folder. The user has the ability to check the Junk E-Mail
folder to look for valid messages. If a user finds a valid e-mail
message, he or she has the option to move it out of the Junk E-Mail
folder and back into the Inbox.
To understand which
spam filter for exchange 2000 will move to
the Junk E-Mail folder requires that you understand how it is scored
with Microsoft technology. Scoring is accomplished by analyzing several
factors:
Searching the
spam filter exchange
2000 of the message for key phrases or words.
Analyzing the source of the message and how many servers it traversed.
Analyzing the subject line for common advertisements.
Looking at the number recipients of the message and the means that they
were included (i.e.: bcc lists). All of these factors are assigned
weight and plugged into an heuristic algorithm that computes a numerical
value that falls within a range of one (not spam) to nine (almost
definitely spam).
There are two options available to campus users for filtering their
mailbox against junk e-mail: server-side filtering and client-side
filtering.
For the latest information about
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The spam filter exchange 5.5
hosted solution
The filtering process is likely to periodically fail to identify a "junk
e-mail" as such. Conversely, it is also possible that valid messages
will periodically be identified as "junk e-mail." Within Microsoft
Outlook and Webmail, you can create rules to trust mail from certain
senders and to always regard mail from other senders as spam. Rules set
in
Exchange Spam blocker
will apply to both server-side filtering and client-side filtering if
both are enabled. The purpose of moving junk e-mail to a folder instead
of simply deleting it is to give the user an opportunity to review
what's been sorted for potentially valid messages. If a message is
valid, it can be moved back to the Inbox, and the sorting system can be
told not to sort messages from that sender again.
When a message has sat in the Junk E-Mail folder for more than 30 days,
it will be purged from the folder. If a user believes a valid message
was deleted, the message can be retrieved up to 15 days by using the
"Recover Deleted Items" tool in Microsoft Outlook.
For the latest information about
postfix spam filter
Use spam filter for Microsoft
exchange?
Fortunately, spam filter Microsoft exchange blocking mailed
spams is getting easier - see CIAC bulletin I-005. You can do one of two
different things. The first is straightforward and works well for all
but the biggest sites. This is to block access to your SMTP port so it
can't be used to inject spam (several MTAs (sendmail, exim and qmail)
can make use of the Mail Abuse Protection System's Realtime Blackhole
List to block spam domains -- see usage instructions. The other thing
you do is to block spams from traversing your system. This is more
difficult because older mailers don't give you a good way to look at the
originating address. The Transport Security Initiative is also part of
the MAPS project.
For the latest information about
Exchange Mail Filtering
