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Change the Method for 7-bit Transfer Encoding

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Applies to: Exchange Server 2010 SP3, Exchange Server 2010 SP2

In Microsoft Exchange Server 2010, the 7-bit transfer encoding method for MIME format is fixed to quoted-printable (QP) encoding. You can change the transfer encoding method by editing the EdgeTransport.exe.config file. Use Microsoft Windows Explorer to change the method for transfer encoding on the Microsoft Exchange Server 2010-based computer running the Hub Transport server role.

Looking for other management tasks related to managing transport servers? Check out Managing Transport Servers.

Use Windows Explorer and Notepad to change the method for transfer encoding

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "Hub Transport server" entry in the Transport Permissions topic.

  1. On the Exchange 2010-based server running the Hub Transport server role, start Windows Explorer.

  2. Locate the following folder, in which <drive> represents the actual installation drive: <drive>:\Program Files\Microsoft\Exchange Server\V14\Bin.

  3. Make a backup copy of the EdgeTransport.exe.config file, and name the backup file copy EdgeTransport.exe.config.old.

  4. Start Notepad, and then open the EdgeTransport.exe.config file.

  5. Locate the following line between the <appsettings> tag and the </appsettings> tag.

    <add key="ByteEncoderTypeFor7BitCharsets" value="1" />

    If this line doesn't exist in this location, insert the line between the <appsettings> tag and the </appsettings> tag.

  6. Change the value described in the line to an appropriate value from the table in "Values to Change the Method for Transfer Encoding" later in this topic. This value controls the MIME encoding behavior.

  7. Save the changes, and then exit Notepad.

  8. Start the Microsoft Exchange Transport service.

Values to Change the Method for Transfer Encoding

The following table lists the values that you can use to change the method for transfer encoding. This table also describes the behavior of the value.

Value Behavior

0

Always use default 7-bit transfer encoding for HTML and for plain text.

1

Always use QP encoding for HTML and for plain text.

2

Always use Base64 encoding for HTML and for plain text.

5

Use QP encoding for HTML and for plain text unless line wrapping is enabled in plain text. If line wrapping is enabled, use 7-bit encoding for plain text.

6

Use Base64 encoding for HTML and for plain text, unless line wrapping is enabled in plain text. If line wrapping is enabled in plain text, use Base64 encoding for HTML, and use 7-bit encoding for plain text.

13

Always use QP encoding for HTML. Always use 7-bit encoding for plain text.

14

Always use Base64 encoding for HTML. Always use 7-bit encoding for plain text.

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