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Mail docs: stack-mode gateway + postfix umbrella-unit gotcha (#12)

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emi 2026-07-23 04:45:15 +00:00
parent 6f75762c89
commit 99b4b3f78d
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12
deploy/provision-mail.sh
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@ -67,6 +67,18 @@ postconf -e "myorigin = ${MAIL_DOMAIN}"
# gateway and accepts mail from the bridge subnet (both pinned in
# docker-compose.yml). Set DOCKER_MAIL_GATEWAY="" for a pure loopback-only null
# client (app running natively on the host, not in a container).
#
# WHICH gateway depends on the host's deploy mode: plain compose (beta, LAN)
# uses the pinned compose bridge (172.19.0.1/172.19.0.0/16, the defaults);
# Swarm-stack mode (prod) uses the docker_gwbridge gateway instead --
# overlay tasks have no compose-bridge gateway -- so prod is provisioned with
# DOCKER_MAIL_GATEWAY=172.18.0.1 DOCKER_MAIL_SUBNET=172.18.0.0/16 (plus its
# MESH_MAIL_* listener below). Do NOT list an address that doesn't exist on
# the host: Postfix's master fails to bind and takes ALL listeners down --
# exactly what happened when the compose bridge (172.19.0.1) vanished at the
# stack cutover while still listed in inet_interfaces. Also note: postfix on
# this distro is an umbrella unit; restart `postfix@-`, not `postfix`, for
# inet_interfaces changes to take effect.
DOCKER_MAIL_GATEWAY="${DOCKER_MAIL_GATEWAY-172.19.0.1}"
DOCKER_MAIL_SUBNET="${DOCKER_MAIL_SUBNET-172.19.0.0/16}"
# Optional WireGuard-mesh listener: other mesh nodes (e.g. beta's Forgejo, whose

4
deploy/thermograph.env.example
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@ -131,6 +131,10 @@ THERMOGRAPH_BASE_URL=https://thermograph.org
# plain SMTP to the compose bridge's gateway (172.19.0.1, pinned in
# docker-compose.yml), where Postfix listens and relays out. Switching between
# "direct to MX" and "relay through a provider" is a Postfix change, no redeploy.
# Stack-mode hosts (prod) override this per-service to the docker_gwbridge
# gateway (172.18.0.1) in deploy/stack/thermograph-stack.yml -- overlay tasks
# can't reach a compose bridge gateway; leave this file's value as the compose
# default.
#
# Backends: console (log it, send nothing — the default, right for dev),
# smtp (actually send), disabled (drop silently).