[Mailman-Users] mailman problem group

[d3v1ous at d3v1ous.info]

Hello, i want to start mailman with postfix, everything is ok but when i post new topic on mail list the mail not recive and i see this error on mail.log

Command died with status 2:
    "/var/lib/mailman/mail/mailman post sheet". Command output: Group
mismatch
    error.  Mailman expected the mail wrapper script to be executed as group
    "daemon", but the system's mail server executed the mail script as group
    "nobody".  Try tweaking the mail server to run the script as group
    "daemon", or re-run configure,  providing the command line option
    `--with-mail-gid=nobody'.

How to fix this?