title: Why isn't my log4net appender buffering?
body: <p>I've created a custom log4net appender. It descends from log4net.Appender.SmtpAppender which descends from log4net.Appender.BufferingAppenderSkeleton.</p>
  
  <p>I programatically setup the following parameters in its constructor:</p>
  
  <pre><code>this.Lossy = false;  //don't drop any messages
  this.BufferSize = 3; //buffer up to 3 messages
  this.Threshold = log4net.Core.Level.Error; //append messages of Error or higher
  this.Evaluator = new log4net.Core.LevelEvaluator(Level.Off); //don't flush the buffer for any message, regardless of level
  </code></pre>
  
  <p>I expect this would buffer 3 events of level Error or higher and deliver those events when the buffer is filled. However, I'm finding that the events are not buffered at all; instead, SendBuffer() is called immediately every time an error is logged.</p>
  
  <p>Is there a mistake in my configuration?</p>
  
  <p>Thanks</p>