rpm packaging bug - smtpd user created with shell not /bin/false

http://bugs.contribs.org/show_bug.cgi?id=6025

if ! id smtpd >/dev/null 2>&1
then
    # need to create smtpd user.
    if perl -e 'exit ! defined(getgrnam("postdrop"))'
    then
    # if postfix is installed, we will probably use
    # queue/postfix, which will need this:
        supp="-G postdrop"
    fi
    useradd -r -m $supp smtpd
fi

qpsmtpd needs a user "smtpd", but should not create a home directory or 
give access to a shell.