title: log4j SMTPAppender - Email multiple error messages
body: <p>I am using log4j's SMTPAppender to email me upon each exception, but I'd really prefer it to aggregate emails into one email with a batch of errors rather than one email for each error.</p>
  
  <p>I have seen the bufferSize variable but that appears to be for all types of message, not just ERRORS.</p>
  
  <p>Does anyone know how I might achieve this? </p>
  
  <p>Thanks </p>