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Exchange Server Cookbook
book

Exchange Server Cookbook

by Paul Robichaux, Missy Koslosky, Devin L. Ganger
June 2005
Intermediate to advanced content levelIntermediate to advanced
464 pages
13h 2m
English
O'Reilly Media, Inc.
Content preview from Exchange Server Cookbook

10.8. Controlling Anonymous Address Resolution

Problem

You want to reduce the possibility of outside parties spoofing sender addresses.

Solution

Using a graphical user interface to control address expansion in Exchange 2000

  1. Open the Registry Editor (regedit.exe).

  2. Navigate to:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeTransport
  3. If the Parameters subkey exists, select it. If not, right-click MSExchangeTransport and select New Key.

  4. Each SMTP virtual server has its own subkey under the Parameters key corresponding to its ordinal number. For servers with only 1 SMTP virtual server, this subkey will be named 1. If no key exists for the virtual server that accepts your inbound Internet mail, right-click the Parameters key and select New Key to add it.

  5. Right-click the SMTP virtual server key and select New DWORD Value to create a new value named ResolveP2. Give it the appropriate flag value:

    0x08

    Tells Exchange to resolve the From header in incoming mail

    0x10

    Tells Exchange to resolve the To and CC header fields

    0x20

    Tells Exchange to resolve the Reply-To field

    By default, Exchange will attempt to resolve all these headers, but by changing the flag value you can force it to ignore certain headers.

  6. Quit the Registry Editor.

  7. Stop and restart the SMTP virtual server to which you added this key.

To set the ResolveP2 flag in Exchange Server 2003:

  1. Launch the Exchange System Manager (Exchange System Manager.msc).

  2. In the left pane, expand the appropriate Administrative Groups container, and ...

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Publisher Resources

ISBN: 0596007175Errata Page