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Strange that it seems that postfix is causing the issue.
In the configuration settings; tab Router/SMTP / basic.
Address lookup should be 'FullName', you could enable Exhaustive lookup.
In your Admin via the tab Configuration > Messaging > Domains there is a domain configured? (which handles the conversion of the internet address if all else fails)
But I don't really expect that would fix the issue, but you can still try it.
We are also using Postfix, and have never encountered the error you describe, on any of our systems.
Feedback response number WEBB83DM77 created by ~Delores Xanjumisterings on 03/09/2010