if [ -r /etc/postfix/main.cf ] ; then
# adjust hostname related options:
sed -i "s/grml/$HOSTNAME/g" /etc/postfix/main.cf
- sed -i "s/^myhostname = .*/myhostname = $HOSTNAME/" /etc/postfix/main.cf
- sed -i "s/^mydestination = .*/mydestination = localdomain, localhost, localhost.localdomain, $HOSTNAME/" /etc/postfix/main.cf
# listen on loopback interface only:
sed -i "s/^inet_interfaces = .*/inet_interfaces = loopback-only/" /etc/postfix/main.cf