Octeth Postfix Add-On

This add-on adds a Postfix container to the server so that Octeth can send emails through this Postfix add-on.

Installation Instructions

Build the Docker container:

docker build -t octeth-postfix .

Run the container:

# If this container is going to be running on Octeth's server, run this command:
docker run -d --name octeth-postfix --network oempro-network --dns 1.1.1.1 --dns 8.8.8.8 --dns 8.8.4.4 -p 2526:25 -v $(pwd)/dkim-keys:/etc/opendkim/keys octeth-postfix

Setting Up DKIM

Generating DKIM Keys

Generate a default DKIM key:

docker exec -ti octeth-postfix bash -c "opendkim-genkey -b 2048 -s key1 -D /etc/opendkim/keys/ -v"

or use Octeth DKIM Generator.

DNS Configuration

For each domain, set the DKIM DNS record:

• Record Name: key1._domainkey.test.com
• Record Type: TXT
• Record Value: v=DKIM1; k=rsa; p=... (the full content of default.txt)

Build and Restart Postfix Container

As explained in Installation Instructions section, build the container and start it:

docker kill octeth-postfix
docker container rm octeth-postfix
# Build
# Run

Verifying the Setup

1. Check Postfix logs for DKIM signing:

   docker exec -it postfix-dkim tail -f /var/log/mail.log

2. Send a test email and check the headers to ensure DKIM signing is applied:

   Look for the DKIM-Signature header in the received email.

Setting Up As Octeth Delivery Server

In Octeth's delivery server settings;

• Name: octeth-postfix
• Host: octeth-postfix
• Port: 25
• Security: No secured connection
• Connectin Time Out: 10
• Authentication: Authentication not required
• Link Tracking: {octeth_domain}
• Open Tracking: {octeth_domain}
• MFROM domain: {octeth_domain}