On Wed, Apr 06, 2016 at 01:38:46PM +0000, chaouche yacine wrote:

> maildrop  unix  -       n       n       -       -       pipe
> flags=DRhu user=vmail argv=/var/vmail/maildropwrapper -V9 -d ${recipient}

    http://www.postfix.org/pipe.8.html

       user=username:groupname
              Execute the external command with the user ID and  group  ID  of
              the  specified  username.   The software refuses to execute com-
              mands with root privileges, or with the privileges of  the  mail
              system owner. If groupname is specified, the corresponding group
              ID is used instead of the group ID of username.

Note, that pipe(8) is not the "login" program and does not execute
programs with all the group memberships of the specified user.
Only the primary group, or the explicitly selected "groupname" is
available.

-- 
        Viktor.

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