do not delete emails from mail server

for people using email and the support system both to manage clients, would be good not to remove the emails from the mail server once they're fetched, because i for one would like to see them in my email client as well and use that to reply, i know this might require some additional overhead to keep track of whats already downloaded
to go around this, i could setup an additional email account for drupal and forward support@ to that, not sure which is best