I have an iCloud account with an alias set up. I see emails coming into it and after I click on them and read them, they disappear. I can't find them anywhere. The regular .mac account works fine. I only have the main account set up in macmail. I thought to try setting up the iCloud alias as a separate mail account but that doesn't work because the apple ID isn't recognized. Does each alias need its own Apple ID? What is going on? Thanks.