extra/postfix/post-install


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    if [ -z "`grep '^postdrop::' /etc/group`" ]; then
        groupadd -g 75 postdrop >& /dev/null
    fi
    if [ -z "`grep '^postfix::' /etc/group`" ]; then
        groupadd -g 73 postfix >& /dev/null
    fi
    if [ -z "`grep '^postfix:' /etc/passwd`" ]; then
        useradd -u 73 -d /var/spool/postfix -g postfix -s /bin/false postfix
    else
        # fix a packaging bug from before (postfix should have no shell)
        usermod -s /bin/false postfix
    fi

    chown postfix /var/spool/postfix/{active,bounce,corrupt,defer,deferred,\
flush,hold,incoming,private,public,maildrop,trace,saved}
    chown postfix /var/lib/postfix
    chgrp postdrop /var/spool/postfix/{public,maildrop}
    chgrp postdrop /usr/sbin/postqueue
    chgrp postdrop /usr/sbin/postdrop
    chmod g+s /usr/sbin/{postqueue,postdrop}