Easily add domains to OpenDKIM

easy-opendkim.md

Configure a new domain in OpenDKIM

#!/bin/bash

DOMAIN="$1"
SELECTOR="mail"

if [ -z "${DOMAIN}" ]; then
        echo "Usage: $0 domain.name"
        exit
fi

if [ -z "$( dig +short ${DOMAIN} mx)" ]; then
        echo "Domain has no MX records"
        exit
fi

mkdir /etc/opendkim/keys/${DOMAIN}
echo "${SELECTOR}._domainkey.${DOMAIN} ${DOMAIN}:mail:/etc/opendkim/keys/${DOMAIN}/${SELECTOR}.private" >>/etc/opendkim/KeyTable
echo "*@${DOMAIN} ${SELECTOR}._domainkey.${DOMAIN}" >>/etc/opendkim/SigningTable
echo "${DOMAIN}" >>/etc/opendkim/TrustedHosts
sudo opendkim-genkey -b 1024 -d "${DOMAIN}" -D /etc/opendkim/keys/${DOMAIN} -s ${SELECTOR} -v
sudo chown opendkim:opendkim /etc/opendkim/keys/${DOMAIN}/${SELECTOR}.private

sudo cat /etc/opendkim/keys/${DOMAIN}/${SELECTOR}.txt