dockerfile.run

expn

powerful, efficient, and scalable Mail Transport Agent (arch independent files)

Debian

RUN apt-get update && \
    apt-get install -y sendmail-base

Ubuntu

RUN apt-get update && \
    apt-get install -y sendmail-base

Kali Linux

RUN apt-get update && \
    apt-get install -y sendmail-base

Raspbian

RUN apt-get update && \
    apt-get install -y sendmail-base

click the source code to copy install expn on any operating system with command-not-found.com