The problem from what I undestand with Yahoo email is the way in which it's implemented. It's not real "push" email. Instead a specially formatted txt message gets sent to your phone which your phone understands and then checks yahoo to pull down the message. My guess is this txt->email doesn't work as well as it should either because the iPhone misses the text message or it just screws up somewhere in the translation or yahoo's servers could just suck. I prefer having my GMail IMAP check every 5 minutes as I'm guaranteed to get it.
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