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I just need to make sure I understand how you're making this happen. 
 
I can't reproduce it with 0.7.12 (currently in CVS, but no changes have 
been made in the email components for some time now) by: 
 
1. creating a new demo tracker, 
2. copying "templates/classic/detectors/nosyreaction.py" into 
    "demo/detectors" 
3. configuring the demo to send email, and 
4. entering a change note with the chars åäö in it. 
 
The email makes it to me fine, UTF-8 with the chars encoded correctly.