This repository has an example of a postfix relay running in Kubernetes using a helm chart.
You can build the Docker image locally
# For local build
docker build -t eldada.jfrog.io/docker/postfix-relay:0.9 Docker/
# Multi arch build and push
docker buildx build --platform linux/amd64,linux/arm64 -t eldada.jfrog.io/docker/postfix-relay:0.9 Docker/p --pushRun the postfix relay locally for testing
# Need to set SMTP connection details
export SMTP="[smtp.mailgun.org]:587"
export USERNAME_TEST=<your smtp username>
export PASSWORD_TEST=<your smtp password>
# Optional custom configuration to add/override in /etc/postfix/main.cf (delimited by a ";")
export POSTFIX_CUSTOM_CONFIG="key1 = value1;key2 = value2;key3 = value3"
# Set list of allowed networks
export TX_SMTP_RELAY_NETWORKS='10.0.0.0/8,127.0.0.0/8,172.17.0.0/16,192.0.0.0/8'
docker run --rm -d --name postfix-relay -p 2525:25 \
-e TX_SMTP_RELAY_HOST="${SMTP}" \
-e TX_SMTP_RELAY_MYHOSTNAME=my.local \
-e TX_SMTP_RELAY_USERNAME=${USERNAME_TEST} \
-e TX_SMTP_RELAY_PASSWORD=${PASSWORD_TEST} \
-e TX_SMTP_RELAY_NETWORKS=${TX_SMTP_RELAY_NETWORKS} \
-e POSTFIX_CUSTOM_CONFIG="${POSTFIX_CUSTOM_CONFIG}" \
eldada.jfrog.io/docker/postfix-relay:0.9- Connect to running container on port 2525
telnet localhost 2525- Edit the following with your details and paste in your terminal
helo localhost
mail from: [email protected]
rcpt to: [email protected]
data
Subject: Subject here...
The true story of swans singing Pink Floyd.
.
quit- You should see the following
220 tx-smtp-relay.yourhost.com ESMTP Postfix
helo localhost
250 tx-smtp-relay.yourhost.com
mail from: [email protected]
250 2.1.0 Ok
rcpt to: [email protected]
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
Subject: Subject here...
The true story of swans singing Pink Floyd.
.
250 2.0.0 Ok: queued as 982FF53C
quit
221 2.0.0 Bye
Connection closed by foreign host- Check the inbox of
[email protected]and see you got the email.
The Helm Chart in helm/postfix directory can be used to deploy the postfix-relay into your Kubernetes cluster.
Create a custom-values.yaml with the configuration details
smtp:
relayHost: "[smtp.mailgun.org]:587"
relayMyhostname: <your smtp hostname>
relayUsername: <your smtp username>
relayPassword: <your smtp password>
relayNetworks: '10.0.0.0/8,127.0.0.0/8,172.17.0.0/16,192.0.0.0/8'Deploy postfix
helm upgrade --install postfix-relay helm/postfix -f custom-values.yamlAn optional postfix-exporter sidecar can be deployed for exposing postfix metrics. This is using the work from https://github.com/kumina/postfix_exporter.
To enable the exporter sidecar, update your custom-values.yaml file and add
# Enable the postfix-exporter sidecar
exporter:
enabled: true
# Enable a ServiceMonitor object for Prometheus scraping
serviceMonitor:
enabled: trueDeploy postfix
helm upgrade --install postfix-relay helm/postfix -f custom-values.yamlThe work in this repository is based on