🚀 go-pugleaf

I'm using MS Outlook Express to receive email on my Power Mac.

When I log on to the server it goes through the motions of downloading mail
and deposits it in the inbox.  I then get an dialogue saying 'Could not save
this message - Mail Error'

Because of this interruption to the process the mail does not get deleted
from the server.  Subsequently the next time that Outlook checks the server
the same messages are downloaded along with any new ones.  This goes on and
on, all the while the number of messages and hence download time increases.

I can view the message online via Outlook and delete them manually but it is
a bit of a pain.

I have tried re-installing Outlook to no avail.  Any other ideas?