Sending mail using GNU Mailutils inside Docker container

Install ssmtp and configure to send all mails to your relayhost.

https://wiki.debian.org/sSMTP

Thanks for the response @pilasguru. ssmtp works for sending mail from within a docker container.

Just to make the response more verbose, here are the things one would need to do.

• Install ssmtp in the container. You could do this by the following command.

  RUN apt-get update && apt-get -y install ssmtp.

• You could configure the configurations for ssmtp at /etc/ssmtp/ssmtp.conf

  Ideal configurations.

`

## Config file for sSMTP sendmail## The person who gets all mail for userids < 1000# Make this empty to disable rewriting.root={root-name}# The place where the mail goes. The actual machine name is required no# MX records are consulted. Commonly mailhosts are named mail.domain.commailhub={smtp-server}# Where will the mail seem to come from?rewriteDomain={domain-name}# The full hostnamehostname=c67fcdc6361d# Are users allowed to set their own From: address?# YES - Allow the user to specify their own From: address# NO - Use the system generated From: addressFromLineOverride=YES

`

• You can directly copy that from your root directory where you're building your docker image. For eg. you keep your configurations in file named: my.conf.

  You can copy them in your docker container using the command:

  COPY ./my.conf /etc/ssmtp/ssmtp.conf

• Send a mail using a simple command such as:

  ssmtp recipient_name@gmail.com < filename.txt

• You can even send an attachment, specify to and from using the following command:

  echo -e "to: {to-addr}\nFrom: {from-addr}\nsubject: {subject}\n"| (cat - && uuencode /path/to/file/inside/container {attachment-name-in mail}) | ssmtp recipient_name@gmail.com

• uuencode could be installed by the command apt-get install sharutils