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listen port configuration #148

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Merged
crazy-max merged 1 commit into from
Aug 1, 2026
Merged

listen port configuration #148

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5 changes: 3 additions & 2 deletions Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,8 @@ FROM crazymax/alpine-s6:${ALPINE_VERSION}-2.2.0.3
ENV S6_BEHAVIOUR_IF_STAGE2_FAILS="2" \
TZ="UTC" \
PUID="1500" \
PGID="1500"
PGID="1500" \
LISTEN_PORT="2500"

RUN apk --update --no-cache add \
bash \
Expand All @@ -54,4 +55,4 @@ COPY rootfs /
EXPOSE 2500

HEALTHCHECK --interval=10s --timeout=5s \
CMD printf 'EHLO localhost\r\nQUIT\r\n' | nc -w 2 127.0.0.1 2500 | grep -q '^250' || exit 1
CMD printf 'EHLO localhost\r\nQUIT\r\n' | nc -w 2 127.0.0.1 "$LISTEN_PORT" | grep -q '^250' || exit 1
3 changes: 2 additions & 1 deletion README.md
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Expand Up @@ -79,6 +79,7 @@ linux/s390x
* `TZ`: Timezone assigned to the container (default `UTC`)
* `PUID`: Daemon user id (default `1500`)
* `PGID`: Daemon group id (default `1500`)
* `LISTEN_PORT`: Container listen port for msmtpd, useful with host, macvlan, or ipvlan networking (default `2500`)
* `SMTP_HOST`: SMTP relay server to send the mail to. **required**
* `SMTP_PORT`: Port that the SMTP relay server listens on. Default `25` or `465` if TLS.
* `SMTP_TLS`: Enable or disable TLS (also known as SSL) for secured connections (`on` or `off`).
Expand Down Expand Up @@ -107,7 +108,7 @@ linux/s390x

## Ports

* `2500`: SMTP relay port
* `2500`: SMTP relay port, configurable through `LISTEN_PORT`

## Usage

Expand Down
2 changes: 1 addition & 1 deletion rootfs/etc/cont-init.d/03-create-service.sh
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Expand Up @@ -6,6 +6,6 @@ cat > /etc/services.d/msmtpd/run <<EOL
#!/usr/bin/execlineb -P
with-contenv
s6-setuidgid ${PUID}:${PGID}
msmtpd --interface=0.0.0.0 --port=2500 --command="/usr/bin/msmtp -f %F"
msmtpd --interface=0.0.0.0 --port=${LISTEN_PORT} --command="/usr/bin/msmtp -f %F"
EOL
chmod +x /etc/services.d/msmtpd/run
3 changes: 2 additions & 1 deletion test/compose.yml
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Expand Up @@ -5,12 +5,13 @@ services:
image: ${MSMTPD_IMAGE:-crazymax/msmtpd}
container_name: ${MSMTPD_CONTAINER:-msmtpd}
ports:
- target: 2500
- target: 2525
published: 2500
protocol: tcp
environment:
- "TZ=Europe/Paris"
- "PUID=1500"
- "PGID=1500"
- "LISTEN_PORT=2525"
- "SMTP_HOST=smtp.foo.bar"
restart: always