I don't know whether this feature already  exists, but if not, I think it
could be useful and hold down net load.
  Large or  frequently obtained  files out of  filelists could  be marked
CUMMULATE and  the files won't be  sent at once, but  the requests queued
and then be distributed  by night as LISTSERV jobs. The  user could get a
notification that his/her file will be sent at <time>.
 
  \Maex
 
P.S: don't mail to me directly, as my account is valid only to get mail
   from MAILER@DEARN, MAILER@MITVMA, LISTSERV@DEARN  and LISTSERV@FINHUTC