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LambdaMail/.env.example
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# --- Postgres ---
POSTGRES_DB=lambdamail
POSTGRES_USER=lambdamail
POSTGRES_PASSWORD=change-me-in-local-dev
# --- Redis ---
REDIS_PASSWORD=change-me-in-local-dev
# --- Shared secrets (local dev values — never reuse in production) ---
JWT_SECRET=local-dev-jwt-secret-change-me
# Encrypts DKIM private keys and provider tokens at rest. Losing it makes every
# stored secret unrecoverable — back it up separately from the database.
LAMBDAMAIL_MASTER_KEY=local-dev-master-key-32-bytes-min
# --- Host identity ---
PRIMARY_MAIL_HOST=mail.localhost
MAIL_DOMAIN=localhost
PUBLIC_IPV4=127.0.0.1
PUBLIC_IPV6=
# --- DNS automation (Cloudflare) ---
# The token needs Zone.DNS:Edit plus Zone.Zone:Read on the zone. Leave it empty
# to disable reconciliation; the service then logs that DNS sync is off.
CLOUDFLARE_API_TOKEN=
DNS_SYNC_INTERVAL_SECONDS=21600
# --- TLS ---
# traefik: read the certificate Traefik manages (default, DANE not possible).
# acme: obtain the certificate ourselves via DNS-01. Required for DANE,
# because only this mode can reuse a pre-generated key.
TLS_MODE=traefik
# Used only when TLS_MODE=acme. Leave ACME_DIRECTORY_URL empty for Let's
# Encrypt production; point it at the staging directory while testing, since
# production rate limits can lock a domain out for a week.
ACME_EMAIL=
ACME_DIRECTORY_URL=
COOLIFY_PROXY_DIR=./local/acme
TRAEFIK_ACME_FILENAME=acme.json
CERT_POLL_INTERVAL_SECONDS=60
# Static certificate files, used when no ACME store is available (local dev).
PROTOCOLS_CERT_PATH=/etc/lambdamail/certs/cert.pem
PROTOCOLS_KEY_PATH=/etc/lambdamail/certs/key.pem
PROTOCOLS_SPOOL_DIR=/var/lambdamail/spool
# --- Transport security policy ---
# Start at "testing": senders honour the policy but do not hard-fail on it.
# Promote to "enforce" only once TLS-RPT reports come back clean.
MTA_STS_MODE=testing
OUTBOUND_MTA_STS_ENABLED=true
# DANE stays off unless TLS_MODE=acme. Under Traefik-managed certificates the
# key changes at every renewal and the published TLSA record stops matching,
# which permanently rejects mail at every validating MTA.
OUTBOUND_DANE_ENABLED=false
DNSSEC_RESOLVER=1.1.1.1:53
MAX_MESSAGE_BYTES=52428800
# ARC seals accepted messages so a downstream receiver can still tell that the
# mail authenticated at the first hop. Only worth enabling on a host that
# forwards mail onward.
ARC_SEAL_ENABLED=false
# --- Smarthost (for hosts where outbound port 25 is blocked) ---
# Setting RELAY_HOST routes all delivery through the relay and adds it to the
# published SPF record, without which every relayed message fails SPF.
RELAY_HOST=
RELAY_PORT=587
RELAY_USER=
RELAY_PASS=
# --- Webmail ---
WEBMAIL_HOST=localhost:3000
ADMIN_HOST=