Juan:
I don't have it handy but remember serveral years ago when we had a lot of clients using Outlook 2010 we would need to fix the "random replace recipient" problem from time to time. We found we could resolve it by following the Microsoft procedure for deleting the auto-complete database. At the time it sounded more to me to be a known issue with Outlook than a SmarterMail specific issue. The resolution was certainly in Outlook.
SmarterMail(tm)
MAPI over HTTP - Let's flesh it out for Outlook with a full set of Exchange like features!