Postfix stable release 3.7.0
http://www.postfix.org/announcements.html
docker run postfix postconf mail_version | sed 's/mail_version = //'
Dockerfile
FROM alpine:edge
RUN apk add --no-cache \
bash gawk cyrus-sasl cyrus-sasl-login cyrus-sasl-crammd5 mailx \
postfix
EXPOSE 25
build multiarch images on Ubuntu with buildx and qemu-user-static
https://github.com/multiarch/qemu-user-static
docker run --rm --privileged multiarch/qemu-user-static:register
docker buildx build --platform linux/arm64 -t postfix .
docker run --rm postfix uname -m
aarch64
docker run --rm postfix postconf mail_version
mail_version = 3.7.0