Several readers are reporting an issue where Yahoo! email accounts do not push messages to the iPhone.
Yahoo! Mail accounts are the only type of accounts currently accessible by the iPhone that offer push services. This, in theory, means that you will be instantly notified when a new message lands in your Yahoo! account mailbox. The service works by routing email through imap.apple.mail.yahoo.com, a mail server designated specifically for the iPhone by Yahoo!. Other IMAP and POP accounts accessed by the iPhone must rely on time-interval checking (ranging from every 15 minutes to every hour, toggled … Read more