sudo -i

Install NVM (Node Version Manager)

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash

export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm")"

[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"

Install Node (LTS)

nvm install --lts

Install Haraka

apt install build-essential

npm -g config set user root

npm install -g Haraka

cd /var/mail && haraka -i .

vim /var/mail/config/smtp.ini

; Server public IP
public_ip=x.x.x.x

; Daemonize
daemonize=true
daemon_log_file=/var/log/haraka.log
daemon_pid_file=/var/run/haraka.pid

; Spooling
; Save memory by spooling large messages to disk
spool_dir=/var/spool/haraka

haraka -c /var/mail

Allows incoming SMTP request on port 25 for server IP address x.x.x.x

iptables -A INPUT -p tcp -s 0/0 --sport 1024:65535 -d x.x.x.x --dport 25 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -p tcp -s x.x.x.x --sport 25 -d 0/0 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT

Allow outgoing SMTP requst for server IP address x.x.x.

iptables -A OUTPUT -p tcp -s x.x.x.x --sport 1024:65535 -d 0/0 --dport 25 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A INPUT -p tcp -s 0/0 --sport 25 -d x.x.x.x --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT