I leave my email on the server so I can view it from another computer when I
am away. Sometimes when I have not cleared it all off the server it will all
come down to my home computer a second time a day or two later. This is a
pain because I have already read and filtered the mail prior to this
happening. I have thought that it was being caused by my ISP resetting their
mail server and causing this but they say no? Further explanation is, I read
my email and delete it from my home machine, but leave it on the server. I go
away for a couple of days and when I get back the email that I have already
read comes back down with the new email sometimes, not all the time though.