Postfix vm-pop3d Docker

Installing Docker

https://docs.docker.com/engine/installation/

Launch Kitematic terminal (OSX/Windows users)

Click File -> Open Docker Command Linke Terminal

Kitematic offers a GUI interface for docker

Start container

docker-compose up

Configure users

This example configures me@mydomain.com and another@mydomain.com . The me@mydomain.com mailbox will also receive any other mail for mydomain.com not explicitly configured.

./demo.sh from the host will do this, just enter a pw1 and a pw2 .

docker exec -u vmail postfix-vm-pop3d-alpine-pop3-1 mkdir -p /var/spool/virtual/mydomain.com
echo mydomain.com placeholder |docker exec -i postfix-vm-pop3d-alpine-smtp-1 sh -c 'cat - > /etc/virtual/vmaildomains'
docker exec -t postfix-vm-pop3d-alpine-smtp-1 postmap /etc/virtual/vmaildomains

echo another@mydomain.com mydomain.com/another |docker exec -i postfix-vm-pop3d-alpine-smtp-1 sh -c 'cat - >/etc/virtual/vmailbox'
echo @mydomain.com mydomain.com/me |docker exec -i postfix-vm-pop3d-alpine-smtp-1 sh -c 'cat - >>/etc/virtual/vmailbox'
docker exec -t postfix-vm-pop3d-alpine-smtp-1 postmap /etc/virtual/vmailbox

docker exec postfix-vm-pop3d-alpine-pop3-1 mkdir -p /etc/virtual/mydomain.com
docker exec -it postfix-vm-pop3d-alpine-pop3-1 htpasswd -c -B /etc/virtual/mydomain.com/passwd me
docker exec -it postfix-vm-pop3d-alpine-pop3-1 htpasswd -B /etc/virtual/mydomain.com/passwd another

echo mail.mydomain.com |docker exec -i postfix-vm-pop3d-alpine-smtp-1 sh -c 'cat - > /etc/virtual/mailname'

Test

ncat 127.0.0.1 25
ehlo test.com
mail from: test@test.com
rcpt to: another@mydomain.com
data
Subject: Test

test
.
quit
^C

ncat 127.0.0.1 110
user another@mydomain.com
pass pw2
stat
retr 1
dele 1
quit
^C

openssl s_client -connect 127.0.0.1:995
user another@mydomain.com
pass pw2
quit

openssl s_client -connect 127.0.0.1:465
ehlo test.com
mail from: test@test.com
rcpt to: another@mydomain.com
data
Subject: Test

test
.
quit

Development - when updating diffs for a new distro version

To export the new distribution files, for example for postgrey

docker compose build postgrey
mkdir -p postgrey/config/tmp/dist
docker compose run --entrypoint /export.sh postgrey |base64 -d |tar x -C postgrey/config/tmp/dist
cp -r postgrey/config/tmp/dist postgrey/config/tmp/new

update the files in tmp/new

finally

docker compose build postgrey
docker compose run --entrypoint /diff.sh postgrey |base64 -d |tar x -C postgrey/config/diff
docker compose build postgrey

Restart policy

Particularly on a CoreOS host, it is wise to set a restart policy. Unfortunately this is not yet possible from docker-compose, I think, but the script file update-restart.sh will effect this.res

lutnos / postfix-vm-pop3d-alpine

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