I noticed that after I read and delete email from my MBA, they don't automatically delete from my iPhone. But if I just read them on my MBA, they show read (without that blue dot indicating/appearing) besides new emails. Anyway, I'm trying to avoid opening these spam emails that I've already deleted from my MBA, but on the iPhone, I can't just delete them. I have to open them before deleting them. Therefore, is iOS vulnerable to potential viruses if I open these emails to delete them off my iPhone?