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Whacking Spam with ISA Server 2000

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Title: Whacking Spam with ISA Server 2000


1
Whacking Spam with ISA Server 2000
  • Thomas W Shinder MD

2
TECHNICAL FAQs
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3
Dr. Tom Shinder
  • ISA Server guru in residence at www.isaserver.org
  • Editor of the Brainbuzz Network Admin Weekly
    Newsletter
  • Editor of Sunbelt-Software WinXPNews
  • Author of best selling Configuring ISA Server
    2000 Creating Firewalls with Windows 2000
  • Author or contributors to over 20 Windows 2000
    and networking books

4
Introduction
  • Spam Blocking Methods
  • ISA Server Message Screener
  • GFI Softwares MailSecurity
  • Summary and Analysis of Spam whacking

5
Spam Blocking Methods
  • Client side solutions
  • Outlook Junk Mail Filters
  • Outlook Express Message Rules
  • iHateSpam, Mail Washer, etc.
  • Server side solutions
  • ISA Server Message Screener
  • GFI MailSecurity

6
ISA Server Message Screener
  • Message Screener works with the SMTP Filter
  • SMTP Filter must be enabled
  • Message Screener is not the same as the SMTP
    Filter
  • Message Screener can be installed on the ISA
    Server, an SMTP Relay or an Exchange Server
  • Preferred solution is on a dedicated SMTP relay
  • IIS 5.0 required cannot install on IIS 4.0 SMTP
    service
  • Message Screener does not control relay!
  • Can screen both incoming and outgoing traffic
  • Message Screener does not recognize incoming and
    outgoing traffic
  • Same rules apply to incoming and outgoing SMTP
    traffic

7
Installing and Configuring the SMTP Message
Screener
  • Install the Message Screener Software on the IIS
    5.0 machine
  • Enable the SMTP Application Filter
  • Configure the IIS 5.0 SMTP Server
  • Configure Remote Domains
  • Configure Relay
  • Configure permissions with the SMTPCred tool
  • Configure DCOM Permissions

8
Installing the Message Screener
  • Run from the ISA Server CD if installing on an
    SMTP Relay or the Exchange Server
  • Use the Add/Remove button to add the Message
    Screener to the ISA Server if you did not install
    it when the ISA Server was installed
  • If you install on a dedicated SMTP relay or the
    ISA Server, you need to enable the IIS 5.0 SMTP
    service
  • If you install on the ISA Server, you must
    disable SMTP service socket pooling

9
Enable the SMTP Filter
10
Enable the SMTP Filter
  • SMTP Application Filter is disabled by default
  • SMTP filter examines SMTP traffic even without
    Message Screener
  • Only examines for SMTP buffer overflows as
    stand-alone
  • Current implementation of the SMTP Filter does
    not support AUTH

11
Configure IIS 5.0 SMTP Service
12
Configure IIS 5.0 SMTP Service
  • Configure a Remote Domain
  • Remote domains for all your email domains
  • You will allow relay only for these domains
  • All mail not directed to a Remote domain is
    rejected

13
Configure IIS 5.0 SMTP Servce
14
Configure IIS 5.0 SMTP Service
  • Relay configuration for default SMTP virtual
    server
  • NO relay if used only for incoming messages
  • Limited relay if used for outgoing messages
  • Allow only internal mail servers to access
    outbound relay

15
Configure Credentials
  • Message Screener on independent relay or internal
    Exchange Server
  • Do not need to configure credentials if on ISA
    Server
  • Use credentials of user that installed the ISA
    Server or local Admin

16
DCOM Permissions
17
Message Screener Variations
  • Do not need to configure SMTPcred tool
    credentials when installed on ISA Server
  • Do not need to configure DCOM permissions when
    installed on the ISA Server
  • If the Message Screener is installed on an
    Exchange Server, it will not reliably screen
    outbound messages from Outlook MAPI clients
  • If Message Screener is installed on the Exchange
    Server, it will screen all messages inbound and
    outbound using SMTP

18
Configuring the Message Screener
  • Filtering Email Attachments
  • Filtering by account or domain
  • Filtering by keywords

19
Message Screener Configuration
20
Message Screener Configuration
21
Message Screener Configuration
22
Message Screener Recommendations
  • Use a dedicated SMTP relay
  • Keep the Message Screener off the ISA Server and
    Exchange Server
  • If the Message Screener is off the ISA Server,
    make sure to configure SMTP credentials and DCOM
    permissions
  • Image your server regularly, since you cant back
    up your configuration!

23
For More Information
24
Thank you
  • If you have any additional questions or comments
    for Tom, send them to editor_at_searchwin2000.com.
    Be sure to note that the question relates to the
    ISA Server Message Screener webcast.
  • For an immediate response to a question, go to
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    Answer forum. Navigate from the home page. Tom
    will patrol the forum through the end of
    November.
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