Receiving 'delay delivery' emails in Outlook 2007 with Google IMAP

I wrote an email on January 23rd and set 'delay delivery' in Outlook for it to send on January 31st. The email recipients received the email, but the sent date on the email stated January 23 and not January 31. Therefore, this email was stored as a message received in January 23 and all the way down in their inbox as new mail received from last week, instead of today and at the top of their inbox.
This happens only after we switched to Google IMAP. Help?
 
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