I have the e-mail for my set up so that it only keeps e-mails for 3 days.

The problem is: once the inbox is set up, it keeps receiveing e-mails and will not delete the e-mails which are older than 3 days. The only way it "cleans up" the inbox is if I set the inbox to 7 days, close the application and reset it to 3 days after I reopen the inbox.

Does anyone know what is wrong and what I can do to fix it?

Thanks in advance,