Forgotten password email problem

Can anyone help? Without this working, MLF is rendered pretty useless to me. I can invoke PHP's mail() function successfully, which is what I thought MLF used, so I don't know what could be wrong.

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Forgotten password email problem - Laurence, 2009-08-07, 10:47
- Forgotten password email problem - Laurence, 2009-08-08, 18:59
  - Alex, can you help - Forgotten password email problem - Greg, 2009-10-13, 00:13
  - Forgotten password email problem - Mark Watson, 2009-11-05, 23:44
    - Forgotten password email problem - Egon, 2009-11-06, 10:24
      - Forgotten password email problem - Mark Watson, 2009-11-06, 11:29
        
        Forgotten password email problem - Auge, 2009-11-06, 15:22
      - Forgotten password email problem - Mark Watson, 2009-11-09, 01:27
  - Forgotten password email problem - Laurence, 2009-11-06, 08:52
    - Forgotten password email problem - Mark Watson, 2009-11-13, 15:01
      - Forgotten password email problem - Auge, 2009-11-13, 20:10
      - Forgotten password email problem - Auge, 2009-11-16, 00:44
        
        Forgotten password email problem - Mark Watson, 2009-11-23, 01:09
        
        Forgotten password email problem - Auge, 2009-11-23, 03:31
        
        Forgotten password email problem - Mark Watson, 2009-11-26, 19:11
        
        Forgotten password email problem - Auge, 2009-11-26, 20:47
        
        Forgotten password email problem - Charley, 2009-12-14, 09:07

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