log4net smtpappender subject based on log level - log4net

Question

Is it possible to configure log4net to have two smtp appenders - one that sends emails only when log level is >= WARN and second that sends everything, but never two on the same time.
<appender name="SmtpAppenderWarn" type="log4net.Appender.SmtpAppender">
<to value="to#domain.com" />
<from value="from#domain.com" />
<subject value="Import completed with warnings / errors" />
<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 [%property{NDC}] - %message%newline%newline%newline" />
</layout>
</appender>
<appender name="SmtpAppenderSuccess" type="log4net.Appender.SmtpAppender">
<to value="to#domain.com" />
<from value="from#domain.com" />
<subject value="Import completed successfully" />
<smtpHost value="localhost" />
<bufferSize value="512" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date %-5level %logger: %message%newline" />
</layout>
<filter type="log4net.Filter.LevelMatchFilter">
<levelToMatch value="INFO" />
</filter>
</appender>
I my application I have:
Log.Info("Importer is starting...");
//my logic
//if warn Log.Warn("Warning...");
Log.Info("Import finished");
So I'm using INFO all the time. Now when I encounter WARN both messages are being sent. I wish of course that the one with success info was not sent.

Answer 1

I have solved the problem by overriding log4net SendBuffer method:
namespace MyProject
{
public class SmtpAppenderInfoOnly : SmtpAppender
{
protected override void SendBuffer(log4net.Core.LoggingEvent[] events)
{
foreach (var loggingEvent in events)
{
if (loggingEvent.Level != Level.Info)
return;
}
base.SendBuffer(events);
}
}
}
And then in config file:
<appender name="SmtpAppenderSuccess" type="MyProject.SmtpAppenderInfoOnly,MyDll">
That way the SendMail method will not be executed when SendBuffer is canceled.

Answer 2

Your appenders can have min/max values like so:
<levelMin value="INFO" />
<levelMax value="INFO" />
<levelMin value="WARN" />
<levelMax value="WARN" />
So you can use different appenders for different ranges. I believe this should work for you.