It works on this forum, but not my own ><

I tried the same email address for this forum, and I receive the email, but it doesn't work on my own installation. I'm running 2.1.1.

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Email problems - Laurence, 2009-08-04, 14:21
- It works on this forum, but not my own >< - Laurence, 2009-08-04, 14:56
  - It works on this forum, but not my own >< - Laurence, 2009-08-04, 15:09
    - It works on this forum, but not my own >< - Eric, 2009-08-11, 07:24
      - It works on this forum, but not my own >< - Laurence, 2009-08-11, 07:55

my little forum