Is there a Docker image available for MIMEDefang?
Yes, for Postfix and Sendmail. Official MIMEDefang Docker images are published on Docker Hub, one per supported MTA:
Pull the latest image:
docker pull mimedefang/postfix
docker pull mimedefang/sendmail
The images are suitable for running MIMEDefang in containerized environments. Refer to the image page on Docker Hub for available tags, environment variables, and volume mount points.
OpenSMTPD is also a supported MTA, but no Docker image is published for it yet.