mail transfer agent sed -i "/postfix/d" /etc/passwd sed -i -e "/postfix/d" -e "/postdrop/d" /etc/group echo "postfix:x:8:8:postfix::/bin/false" >> /etc/passwd echo "postfix:x:8" >> /etc/group echo "postdrop:x:9:" >> /etc/group grep -q lmdb: /etc/postfix/main.cf || sed -i -e 's@hash:/@lmdb:/@g' /etc/postfix/main.cf newaliases postmap /etc/postfix/access postmap /etc/postfix/canonical postmap /etc/postfix/generic postmap /etc/postfix/relocated postmap /etc/postfix/transport postmap /etc/postfix/virtual sed -i "/postfix/d" /etc/passwd sed -i -e "/postfix/d" -e "/postdrop/d" /etc/group