Broad fix for SecurityException when deleting emails. On Android 4.3, by default exported=false for providers instead of true before. Only recent version of K-9 Mail have it

See
  . http://stackoverflow.com/questions/18847302/securityexception-permission-denial-opening-provider
  . https://github.com/k9mail/k-9/commit/06ae2a071b80b063ae4eafb635d6f8df728d4d6d