Send email on testing docker container with php and sendmail

Question

I\'m on ubuntu 16.04. I have a (testing) docker (docker-compose) container running php 5.6 and apache 2.4.

On the production platform (without docker) the mail is sent w

Answer 1

If it says:

"Package 'ssmtp' has no installation candidate"

You can use msmtp instead.

Add the following to your dockerfile

# sendmail config
#################
ARG SMTP_PASSWORD=not_provided
# install
RUN apt-get install -q -y msmtp mailutils
# config
COPY msmtprc /etc/msmtprc
RUN chmod 600 /etc/msmtprc
RUN chown www-data:www-data /etc/msmtprc
ARG SMTP_PASSWORD=not_provided
RUN sed -i "s|YourAwesomeStr0ngP4zzw0rd|$SMTP_PASSWORD|g" /etc/msmtprc
# Set up php sendmail config
RUN echo "sendmail_path=/usr/bin/msmtp -t" >> /etc/php/7.3/apache2/conf.d/php-sendmail.ini

Add a msmtprc file to your docker build context:

account default
host mail.yoursmtpserver.com
port 587
tls on
tls_starttls on
tls_trust_file /etc/ssl/certs/ca-certificates.crt
tls_certcheck on
auth on
user my@mail.com
password "YourAwesomeStr0ngP4zzw0rd"
from "my@mail.com"
logfile /var/log/msmtp.log

note: Some changes were made in order to make it work with my particular setup (branching FROM eboraas/apache-php). This applies particularily to the lines:

• ARG SMTP_PASSWORD=not_provided
• RUN chown www-data:www-data /etc/msmtprc
• RUN sed -i "s|YourAwesomeStr0ngP4zzw0rd|$SMTP_PASSWORD |g" /etc/msmtprc
• RUN echo "sendmail_path=/usr/bin/msmtp -t" >> /etc/php/7.3/apache2/conf.d/php-sendmail.ini

You may need to adapt paths, passwords and so on to fit your needs. Keep in mind to set the SMTP_PASSWORD build argument from environment (e.g. SMTP_PASSWORD= docker-compose build) if you want to use this solution straight away.

Useful resources:

• https://wiki.debian.org/msmtp
• https://owendavies.net/articles/setting-up-msmtp/
• https://wiki.archlinux.org/index.php/msmtp#Send_mail_with_PHP_using_msmtp
• linux msmtp configuration sends from shell but fails from PHP/apache