Frozen message in exim

[Daniel de los Reyes <dadecal@s2-selling.com>]

I have this is exim's log:

2000-11-30 18:08:01 Start queue run: pid=2778
2000-11-30 18:08:01 13kqJX-0000UX-00 Message is frozen
2000-11-30 18:08:01 End queue run: pid=2778
2000-11-30 18:38:01 Start queue run: pid=577
2000-11-30 18:38:01 13kqJX-0000UX-00 Message is frozen
2000-11-30 18:38:01 End queue run: pid=577    

I have this frozen message lying arround since I installed Potato some months 
ago. 
Why can this be?
Is there a way to know something about the message?
How do I get rid of it?
 
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Daniel de los Reyes
S2-Selling Soluciones
Valencia Spain
e-mail: dadecal@s2-selling.com
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