emailwiz/adddomain.sh

#!/bin/sh

new_domain="$1"
mail_service_domain="$2"

# Check if both domains are provided
[ -z "$new_domain" ] || [ -z "$mail_service_domain" ] && { echo "Usage: $0 new_domain mail_service_domain"; exit 1; }

subdom="mail"
maildomain="$subdom.$mail_service_domain"

# Add the new domain to the valid postfix addresses.
if ! grep -q "^mydestination.*$new_domain" /etc/postfix/main.cf; then
    sed -i "s/^mydestination.*/&, $new_domain/" /etc/postfix/main.cf
fi

# Create DKIM for the new domain.
mkdir -p "/etc/postfix/dkim/$new_domain"
opendkim-genkey -D "/etc/postfix/dkim/$new_domain" -d "$new_domain" -s "$subdom"
chgrp -R opendkim /etc/postfix/dkim/*
chmod -R g+r /etc/postfix/dkim/*

# Add entries to keytable and signing table.
echo "$subdom._domainkey.$new_domain $new_domain:$subdom:/etc/postfix/dkim/$new_domain/$subdom.private" >> /etc/postfix/dkim/keytable
echo "*@$new_domain $subdom._domainkey.$new_domain" >> /etc/postfix/dkim/signingtable

systemctl reload opendkim postfix

# Print out DKIM TXT entry.
pval="$(tr -d '\n' <"/etc/postfix/dkim/$new_domain/$subdom.txt" | sed "s/k=rsa.*p=/k=rsa; p=/;s/\"\s*\"//g;s/\"\s*.*//g" | grep -o 'p=.*')"

dkimentry="$subdom._domainkey.$new_domain	TXT	v=DKIM1; k=rsa; $pval"
dmarcentry="_dmarc.$new_domain	TXT	v=DMARC1; p=reject; rua=mailto:dmarc@$new_domain; fo=1"
spfentry="$new_domain	TXT	v=spf1 mx a:$maildomain -all"
mxentry="$new_domain	MX	10	$maildomain"

echo "$dkimentry
$dmarcentry
$spfentry
$mxentry" >> "$HOME/dns_emailwizard_added"

echo "=== ADD THE FOLLOWING TO YOUR DNS TXT RECORDS ==="
echo "$dkimentry
$dmarcentry
$spfentry
$mxentry"
echo "They have also been stored in $HOME/dns_emailwizard_added"