[EXIM] Case sensitive users

Hi there;

I have one problem; I have running exim 2.05 in a Solaris 2.6 box, and I
have users with mixed case: msaaH and when send mail to this user i have
the folowing error:

 msaaH@???:
    unknown local-part "msaah" in domain "mydomain.net"  

How can I fix this problem....???

thanks...


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