dkim-key

#!/bin/bash

domain=$1
selector="mail"

if [ ! $domain ];then
    echo "Domain name must be provided (dkim-key domain.com)"
    exit 2
fi

mkdir -pv /etc/opendkim/$domain/
chown -Rv opendkim:opendkim /etc/opendkim
chmod go-rwx /etc/opendkim/*

cd /etc/opendkim/$domain/
opendkim-genkey -r -h sha256 -d $domain -s $selector
mv -v mail.private $selector
chown opendkim:opendkim *
chmod u=rw,go-rwx *

echo "$domain $domain:mail:/etc/opendkim/$domain/$selector" >> /etc/opendkim/KeyTable
echo "*@$domain $domain" >> /etc/opendkim/SigningTable
echo "$domain" >> /etc/opendkim/TrustedHosts

echo "Now add this TXT record in the DNS configuration for $domain"
cat mail.txt