SmtpAppender - Cannot Access CDO.Message

[Norman Fung]

Hi, I'm trying to send exception notification via log4net's SmtpAppender. 
But I'm having trouble deciphering the following error message:

System.Web.HttpException ... Cannot access "CDO.Message object" ...
Here's what my appender looks like, I think it's okay, but... just in case:
<appender name="SmtpAppender" type="log4net.Appender.SmtpAppender">
           <to [EMAIL PROTECTED]" />
           <from value="[EMAIL PROTECTED]" />
           <subject value="ccc
           <bufferSize value="512" />
           <lossy value="true" />
           <evaluator type="log4net.Core.LevelEvaluator">
               <threshold value="WARN"/>
           </evaluator>
           <layout type="log4net.Layout.PatternLayout">
               <conversionPattern value="%newline%date [%thread] %-5level 
%logger [%ndc] - %message%newline%newline%newline" />
           </layout>
       </appender>

I suspected that it's security problem with my virtual STMP server (IIS on 
XP Professional), so, first thing I did was to check:

MMC console
IIS
Default Virtual SMTP Server (Right click and bring up "properties")
"Access" tab
a. Authentication: Anonymous access permitted.
b. For "Connection" and "Relay", configure an empty list with "All except 
the list below"

But, this apparently didn't solve the problem. Any suggestion? Thanks in 
advance.

btw, I'm searching log4net mailing list archive: 
http://marc.theaimsgroup.com/?l=log4net-user&w=2&r=1&s=log4net+smtpappender+access+cdo.message&q=b

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