This is some of my boilerplate:

4) when responding (REPLY) back to the list, please edit the ORIGINAL
posting, making sure you remove the original's headers e.g., RECEIVED
lines, signature, and most of (all) the text.  Often times all you will
need is a significant SUBJECT: RE: line which REferences the
original.  You few moments of editting will go a long way in reducing the
overhead of FINAID-L and improves everyone's productivity (sometimes it
will prevent the automatic rejection of your posting with the inherent
delay in reprocessing)