There were some reports of earlier reports of international characters not working showing up properly in Confluence. However I've just conducted a few tests (March 8th, 2014) with the following email and results:
Screenshot of email sent using Postbox:
Resulting Confluence Page:
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This was tested both on Confluence 4.3.7 and 5.4.2
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If you still see an issue please report it to:support@artemissoftware.freshdesk.com
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Please include your version of Confluence and logs would be helpful 
thank you!
Brendan