Files
relay/docker-compose.yaml
2026-02-20 16:56:05 +01:00

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# Base compose file — do not edit. Put customizations (data paths, extra
# volumes, env overrides) in docker-compose.override.yaml instead.
# See docker/docker-compose.override.yaml.example for a starting point.
#
# Security note: this container uses network_mode:host (chatmail needs many
# ports: 25, 53, 80, 143, 443, 465, 587, 993, 3340, 8443) and cgroup:host
# (required for systemd). Together these give the container near-host-level
# access. This is acceptable for a dedicated mail server, but be aware that
# the container can bind any port and see all host network traffic.
services:
chatmail:
build:
context: ./
dockerfile: docker/chatmail_relay.dockerfile
args:
GIT_HASH: ${GIT_HASH:-unknown}
image: chatmail-relay:latest
restart: unless-stopped
container_name: chatmail
# Required for systemd — use only one of the following:
cgroup: host # compose v2
# privileged: true # compose v1 (less restricted)
tty: true # required for logs
tmpfs: # required for systemd
- /tmp
- /run
- /run/lock
logging:
driver: json-file
options:
max-size: "10m"
max-file: "3"
environment:
MAIL_DOMAIN: $MAIL_DOMAIN
network_mode: "host"
volumes:
## system (required)
- /sys/fs/cgroup:/sys/fs/cgroup:rw
## data (defaults — override in docker-compose.override.yaml)
- mail:/home/vmail
- dkim:/etc/dkimkeys
- certs:/var/lib/acme
volumes:
mail:
dkim:
certs: