title: mule message gathering exceptions
body: <p>I'm thinking on one problem. If I have simple application which t.ex. send files from one place to another (SFTP) and this sftp connection is broken i catched possible exceptions. If there were t.ex 20 files. Exception strategy would send 20 emails for each try to send file. If there'll be thousands of files?? Is this possible to gather all this catched exceptions to one mail?? </p>
  
  <p>I did non-perfect solution - Exception strategy makes file with exceptions and next this file is consumed in next flow which send "error mail". I think it's not perfect. Do you have better solutions??</p>
  
  <p>I'v seen 
  <a href="https://www.appnovation.com/blog/handling-multiple-errors-mule-collection-aggregator" rel="nofollow noreferrer">https://www.appnovation.com/blog/handling-multiple-errors-mule-collection-aggregator</a>
  But it doesn't work for me. </p>