case sensitive

[Carsten Metz]

If I create a mailbox in like user.Karl and also have a user called Karl,
all starting with capital letters, mail is rejected with: user unknown.
If both start with small letters it works.
Any ideas?

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   Carsten Metz                  mail  c.metz at malaske.com
   IT & Consulting               fon     +49-511-270 6531
   Windthorststr. 3-4            fax     +49-511-270 6533
   D-30167 Hannover              mobil   +49-173-614 6022
                                                 ---------//
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