Not only does it not support IMAP IDLE (which is unbelievably idiotic for a mobile device if confirmed), the iPhone uses proprietary Yahoo authentication – a bad kind. (via Melo, via e-mail)
iPhone IMAP security vulnerability
Created on Jul 20, 2007, 22:40 by Rui Carmo, not updated since.idle, imap, iphone, non-compliance, security, standards, stupidity