I recently set up my Charter email account on my iPhone 4 from a POP3 account to an IMAP email account. Now I am noticing that all my emails in the inbox keep disappearing after a few days. I have checked the Charter account to see if there are any IMAP settings to change but there is nothing, so I don't think they are to blame. There aren't even any settings to add or delete IMAP folders. Any suggestions?