opendKIM autocreate new domain

opendkim.sh

#!/bin/bash

# Gib die Namen der OpenDKIM Config Dateien an
Key_Table="KeyTable"
Signing_Table="SigningTable"
Trusted_Hosts="TrustedHosts"

# Gib deine Mail Adresse an
MAIL="mail@xy.de"

read -p "Enter hostname: " HOSTNAME
HOME=/etc/opendkim/keys/$HOSTNAME

if  [ -n "$HOSTNAME" ]
then
 echo "mail._domainkey.${HOSTNAME} ${HOSTNAME}:mail:/etc/opendkim/keys/${HOSTNAME}/mail.private">> /etc/opendkim/$Key_Table
 echo "*@${HOSTNAME} mail._domainkey.${HOSTNAME}">> /etc/opendkim/$Signing_Table
 echo "*.${HOSTNAME}">> /etc/opendkim/$Trusted_Hosts
 mkdir -p $HOME
 cd $HOME
 opendkim-genkey --bits=4096 -s mail -d $HOSTNAME
 chown opendkim:opendkim mail.private
 sendmail $MAIL < mail.txt
 service opendkim restart
else
 echo "No or wrong hostname"
fi