[horde] Authentication Method ?

[SYED JAHANZAiB ~!~ AA Internet Cable.Network Services]

Hi,
I have setup horde, but its authenticating everyone as a Administrator.
I have sendmail running on the same machine where horde is installed. 
What authentication method in horde should I use so horde can use my already exist mail user ids.





Regards,
SYED JAHANZAIB
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