FROM alpine:3.20

RUN apk add --no-cache postfix ca-certificates

COPY main.cf /etc/postfix/main.cf
COPY virtual /etc/postfix/virtual
RUN postmap /etc/postfix/virtual
COPY entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh && \
    mkdir -p /var/spool/postfix /etc/postfix

# Port 25 nur intern im Docker-Netz (kein -p beim Start!)
EXPOSE 25

ENTRYPOINT ["/entrypoint.sh"]