duplicate mail

"Rony" <[email protected]>
Newsgroups gmane.mail.qmail.ldap
Message-ID <[email protected]> 
 

Dear All, 

I have an issue My qmail-ldap users are added in many groups ,so when ever
some one message to those groups user gets duplicate delivery in their
mailbox. How can i stop that ...is maildrop is a tool for that  ? or
procmail ?  what I change my configuration ?   please help me
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