Neil,
I have not as yet tried your suggestion of downloading headers only.
Under OE I was able to write messages rules based on "Subject Line
Content" to prevent the downloading of large numbers of Yahoo & other
groups, that my wife subscribes to, unto my computer. We are not going
to go to separate email accounts, for many reasons, to solve the
problem. Currently, I am just deleting her messages that arrive on my
machine. I could write rules/filters that would move all of these
directly to a local folder or trash as they are downloaded. We leave
all messages on our POP server for about 5 days, just in case of a whoops!
Don