Read the Feedback. You've asked for Ideas. Just Read the Feedback and Get to work!
It's apparent that New Email is not very good. It's about time to read the feedback and make it better. I pay for my Yahoo account and I certainly don't want the new. It's about time to summarize the feedback and fix the problems.
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J Marsh commented
Go back to the old format for email!!! the new one is no good and needs to be removed.