log4net - configure existing appender programmatically.

Hi, I have added an SMTP appender to my application using Log4Net for logging and notification - but how do you change pre-configured value (in App.Config)? Here's appender section in my configuration file:

Code:

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<appender name="SmtpAppender" type="log4net.Appender.SmtpAppender">
                        <to value="[email protected]" />
                        <from value="[email protected]" />
                        <subject value="xxx" />
                        <smtpHost value="localhost" />
                        <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>

---

The closet thing I found is: http://www.ondotnet.com/pub/a/dotnet...et.html?page=3

But, that's adding a new appender altogether, not re-configuring existing appenders. I need to change to/from email address. Thanks in advance.