A SMTP relay host for transactional based emails from within a k8 cluster.
Has amd64 and arm64 images.
This repository contains Kubernetes config files and a docker image to easily set up a SMTP relay for services such as SendGrid.
I needed to send emails from my local network (e.g. multi-function printer) so wanted a simply relay to sit in front of Gsuite.
Modified from original https://github.com/applariat/kubernetes-postfix-relay-host
Run on docker
docker build -t smtp .
docker run --rm -it -p 2525:25 \
-e TX_SMTP_RELAY_HOST="[smtp.sendgrid.net]:587" \
-e TX_SMTP_RELAY_MYHOSTNAME=tx-smtp-relay.yourhost.com \
-e TX_SMTP_RELAY_USERNAME=username \
-e TX_SMTP_RELAY_PASSWORD=password \
smtp
Send a test message
telnet localhost 2525 220 tx-smtp-relay.yourhost.com ESMTP Postfix helo localhost 250 tx-smtp-relay.yourhost.com mail from: noreply@yourhost.com 250 2.1.0 Ok rcpt to: chris@applariat.com 250 2.1.5 Ok data 354 End data with . Subject: What? My hovercraft is full of eels. . 250 2.0.0 Ok: queued as 982FF53C quit 221 2.0.0 Bye Connection closed by foreign host