I have the same problem with both iPhone and Samsung Galaxy of deleting my e-mails from the inbox of COX.net. I performed the recommended instructions for both POP and IMAP with SSL, I send multiple test e-mails, the e-mails are received on my work account, I send e-mails to my COX account, they are received and remain for a small period of time. They then are deleted/vanish from COX e-mail completely. I have both an iPhone 5S, and a Samsung Galaxy Tab. This issue isn't just with Samsung it's a problem with remote phones/tablets overall, and I don't know what the fix would. The suggestion is to move e-mails from inbox to trash immediately but when you don't manage your e-mails on a daily basis then this approach doesn't work. I have since deleted the e-mail accounts, I see this as the only fix.