How to Modify Attachment Handling Settings
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Microsoft® Outlook Web Access can be configured to handle e-mail attachments in different ways, depending on the requirements of your organization. You can block users from opening, sending, or receiving specified attachment types.
Your Exchange server can handle attachments in the following three ways:
Do not allow attachments
Allow attachments (pending file-type filtering)
Allow attachment access only through specific back-end servers
Before You Begin
Before modifying attachment handling settings, read "Configuring Attachment Handing" in Managing Outlook Web Access. Note that if you set the attachment handling setting on the server to "Allow all attachments" or "Don't allow any attachments," the attachment setting that you configure to determine which front-end servers will handle messages is ignored. For specific steps for how to specify the front-end servers that will handle attachments, see How to Specify the Front-End Servers That Allow for Attachment Handling.
Warning
Incorrectly editing the registry can cause serious problems that may require you to reinstall your operating system. Problems resulting from editing the registry incorrectly may not be able to be resolved. Before editing the registry, back up any valuable data.
Procedure
To modify the attachment blocking settings on an Exchange server
Log on to the Exchange server using the Exchange administrator account, and then start Registry Editor (regedit).
In Registry Editor, locate the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ MSExchangeWeb\OWAOn the Edit menu, point to New, and then click DWORD Value.
In the details pane, name the new value DisableAttachments.
Right-click DisableAttachments, and then click Modify.
Under Base, in Edit DWORD Value, click Decimal.
In the Value data box, type one of the following numbers:
To allow all attachments, type 0.
To disallow all attachments, type 1.
To allow attachments from back-end servers only, type 2.
Click OK.
For More Information
You may also want to determine which servers will allow attachment handling. For specific steps, see How to Specify the Front-End Servers That Allow for Attachment Handling.
For information about managing and configuring Outlook Web Access, see the following topics: