DigitalOcean Email Server

A simple email server over a DigitalOcean $5/month droplet (Debian 9)

Questions? Join 0xboz's Discord.

Features

• DKIM enabled verification
• SPF enabled verification
• DMARC policy enabled
• TLS enabled in Postfix
• 'Catch All' forwarding

Prerequisite

• A top-level domain. Get one at namecheap.com

• Name server pointing to (Instructions)

ns1.digitalocean.com
ns2.digitalocean.com
ns3.digitalocean.com

How-to

• Log into DigtialOcean and add a new domain example.com

• Create a droplet named example.com

• DNS configuration

  • A Record

    @ DROPLET_IP
    www DROPLET_IP

  • MX Record

    @ example.com

  • SPF TXT Record

    @ "v=spf1 a mx ~all"

  • DMARC TXT Record

    _dmarc "v=DMARC1; p=none"

• SSH into the droplet and install git

apt install -y git

• Clone this repo

git clone https://github.com/0xboz/digitalocean_email_server.git
chmod +x -R digitalocean_email_server
cd digitalocean_email_server

• Initial server setup

./set_up_server.sh

• Installation

./install_email_server.sh

• Add DKIM public to DNS record
  • mail._domainkey "v=DKIM1; k=rsa; ..."

DKIM public key is shown at the end of the installation script. A copy is also located at /root/DNS.conf