FROM alpine:3.21.0 LABEL Maintainer="Wolfgang Hottgenroth " LABEL ImageName="" # domain to be used in sender address of sent mails ENV LOCALMAILNAME="" # smarthost to send mail to ENV SMARTHOST="" # ip addresses or networks to allow for relaying, separate multiple ones by semicolon ENV RELAYNETS="" RUN apk add --no-cache exim bash WORKDIR /etc/exim EXPOSE 25