Docker connect Mail catcher with WordPress - wordpress

Question

I want to set a sendmail_path in WordPress' container and use a sendmail provided by another container. In my case its MailHog.
So this is my docker-compose:
version: '2'
services:
wordpress:
image: wordpress
links:
- db:mysql
- mailhog
ports:
- 80:80
domainname: foo.com
hostname: foo
volumes:
- ./public:/var/www/html
environment:
WORDPRESS_DB_PASSWORD: example
depends_on:
- mailhog
mailhog:
image: mailhog/mailhog
ports:
- 1025:1025
- 8025:8025
db:
image: mariadb
environment:
MYSQL_ROOT_PASSWORD: example
I tried executing the command: "echo 'sendmail_path = \"/usr/local/bin/mailhog sendmail\"' > /usr/local/etc/php/conf.d/mail.ini" on WordPress container but it actually prints it...
Does these two have to share the volumes?
PS. I know I can use it as a SMTP server in the APP but I want to deal with it in more automated way.

Answer 1

You don't have MailHog installed in the WordPress container, so the path /usr/local/bin/mailhog doesn't exist.
What you want to do is to send emails via sendmail and those emails must be caught by MailHog. To do this, you must extend the WordPress Dockerfile:
FROM wordpress
RUN curl --location --output /usr/local/bin/mhsendmail https://github.com/mailhog/mhsendmail/releases/download/v0.2.0/mhsendmail_linux_amd64 && \
chmod +x /usr/local/bin/mhsendmail
RUN echo 'sendmail_path="/usr/local/bin/mhsendmail --smtp-addr=mailhog:1025 --from=no-reply#docker.dev"' > /usr/local/etc/php/conf.d/mailhog.ini
Note the --smtp-addr parameter must be in the form <mailhog_hostname>:<mailhog_port>.
Change your docker-compose.yml to build your Dockerfile.
version: '2'
services:
wordpress:
build:
context: ./
dockerfile: ./Dockerfile
links:
- db:mysql
- mailhog
ports:
- 80:80
domainname: foo.com
hostname: foo
volumes:
- ./public:/var/www/html
environment:
WORDPRESS_DB_PASSWORD: example
depends_on:
- mailhog
mailhog:
image: mailhog/mailhog
ports:
- 1025:1025
- 8025:8025
db:
image: mariadb
environment:
MYSQL_ROOT_PASSWORD: example
In this example, the Dockerfile you have written must be named "Dockerfile" and must be in the current directory (where you run docker-compose). You can change the path accordingly. You can remove the 1025:1025 ports entry if you don't need to connect to it from the host.
Now the function mail() should work as intended.