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When you do this for each mail account.. Its going to leave your messages on both Iphone and Mac for seven days before it deletes them. In reality, once the Mac downloads the messages and the iphone downloads them. Changing this setting to 7 days will allow both mac and phone to keep the messages. Its only deleting them from the webmail server online.
Long story short. Chnage the settings as described, for each email account on the Iphone. And all your messages will once again go to both Mac, and phone.
If you have any further questions Lisa, or if you get stuck on any of these steps let me know.
Please remember to rate the effectiveness of the answer given before you go, as thats the only way it shows whether or not I was able to help you. Remember that in some cases you cant always repair or solve the issue, and in those cases getting a correct answer to your question is the best solution possible. If you feel like leaving a one or two star rating please contact me first so I can try and resolve the issue in a more effective manner.Thanks, D.Sandlin