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While it is
impossible to filter out all spam with the attached script you can
greatly reduce the about of spam received by your user community. I
have hosted e-mail for friends, relatives, and a few small businesses
for years and after install my custom spam filter my users saw a VERY
drastic reduction in spam. In the three months before I installed this
spam filter I received over 1,800 spam messages, which is about 23/day.
With the spam filter installed I am now getting less then 8 spam
messages a day, on average. With the help of
IHateSpam, which can be purchased from Sunbelt software, the number
of spam message I see in my Inbox is less then one or two a day. With
IHateSpam?s help I was also able to create a list of over 1,100 spam
host in a day by pointing a script, to be covered in Part 2, at the
folder where it moves all of the spam messages to. After one week of
having the spam filter installed I now have over 1,400 spam host listed
in the AD.
With this simple
solution you can quickly, for only the cost of your time, look like a
hero to your user community by cutting the spam they receive
drastically.
Download the Code
(Code updated 11/27 to resolve a bug that prevented the blocking of mail
from blacklisted IPs)
Jason Sherry is a
Windows Infrastructure Architect for Pro Exchange and specialized in the
Active Directory, Exchange, system management and administration, and
scripting. Before coming to Pro Exchange he worked at NetIQ for five
years, where he was a product manager in their administration and
security product line.
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1)
Securing Exchange 2000
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How to
prevent Unsolicited Commercial E-Mail in Exchange 2000 Server
(Q319356)
http://support.microsoft.com/default.aspx?scid=kb;en-us;319356
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How to
prevent SMTP relaying with Microsoft Exchange Server
http://www.slipstick.com/exs/relay.htm
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How to
secure Simple Message Transfer Protocol Client Message Delivery in
Exchange 2000 (Q319267)
http://support.microsoft.com/default.aspx?scid=kb;EN-US;319267
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2)
Adding Exchange Server Filters
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XADM: How
to Filter Junk Mail in Exchange 2000
http://support.microsoft.com/default.aspx?scid=kb;en-us;q276321
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One thing this article fails to mention
is that the senders information is often forged by spam senders so
these filters aren?t that helpful
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How to
Enable or Disable Message Filtering on a Simple Mail Transfer
Protocol Virtual Server
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q261087
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3)
Anti-Spam Software for Exchange and
Outlook
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http://www.msexchange.org/software/software.asp?cat=AntiSpam
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http://www.slipstick.com/addins/content_control.htm
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4)
Code References
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Supported
Transport Events with CDO
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cdosys/html/_cdosys_supported_transport_events_with_cdo.asp
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Registering Script Sink Bindings
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cdosys/html/_cdosys_registering_script_sink_bindings.asp
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Implementing Sinks with Scripting Languages
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cdosys/html/_cdosys_implementing_sinks_with_scripting_languages.asp
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CdoEventStatus Enum
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cdosys/html/_cdosys_cdoeventstatus_enum.asp
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Messagestatus Field
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cdosys/html/_cdosys_schema_SMTPenvelope_messagestatus.asp
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How to
register a Transport Event Sink for the SMTP Service in Exchange
2000 Server (Q 313404)
http://support.microsoft.com/default.aspx?scid=kb;en-us;313404
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5)
Related Articles
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Rules and
tools to filter junk mail
http://www.slipstick.com/rules/junkmail.htm
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How to
view Internet Headers
http://www.slipstick.com/mail1/viewheaders.htm
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6) Spam related web-sites
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Open
Relay Sites
http://www.ordb.org/
http://relays.visi.com
http://relays.osirusoft.com
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RFC-Ignore
? Since most spamers don?t follow RFC guidelines for SMTP mail
deliver they are listed here
http://www.rfc-ignorant.org
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Spamhaus
Block List ? List and information on the worst spamer on the
internet
http://www.spamhaus.org
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