Is there a way to return the message's Maildir filename and capture it in a variable ? I am trying to create a db of messages and would like to do something like:

xfilter "perlscript $MESG_FILE_NAME $To $From $Subject" to Maildir/.folder

where perlscript would simply input these parameters into some SQL code. The end goal is to have an application the can use the SQL info to forward messages by referencing the filename -- this way I don't have to process message info twice (maildrop will do it once) and i get a unique key and file reference all at the same time.