I am getting the following error message but my mail server (Postfix) is not set up as group "apache". Anybody have an idea why I am getting this error message?

This is the Postfix program at host 'my.mail.host.

I'm sorry to have to inform you that the message returned below could not be delivered to one or more destinations.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can delete your own text from the message returned below.

                    The Postfix program

<mb_two-request@my.mail.host.com>: Command died with status 2: "/var/mailman/mail/mailman request mb_two". Command output: Group mismatch error. Mailman expected the mail wrapper script to be executed as one of the following groups: [mail, nobody, mailman], but the system's mail server executed the mail script as group: "apache". Try tweaking the mail server to run the script as one of these groups: [mail, nobody, mailman], or re-run configure providing the command line option: '--with-mail-gid=apache'.

Thanks,

David