IIS 6/7.5 - Can't send email through Outlook

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IIS6

ASP.NET

IIS

IIS7.5

Tried to send an email by open Outlook in my asp.net project. It works when I run debugging locally. After I deployed it into my IIS 6/7.5, got such an error:

Retrieving the COM class factory for component with CLSID {0006F03A-0000-0000-C000-000000000046} failed due to the following error: 80070005 Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED)). 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.UnauthorizedAccessException: Retrieving the COM class factory for component with CLSID {0006F03A-0000-0000-C000-000000000046} failed due to the following error: 80070005 Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED)).

In the web.config, there is no impersonation.

<authentication mode="Windows"/>

Then, I opened the Component Services wizard. Under Computers\DCOM Config\, I could not find the {0006F03A-0000-0000-C000-000000000046}.
How can I grant the access rights to the resource to the ASP.NET request identity? Thanks.