PHP Sendmail in Docker

Step by step guide for getting sendmail configured in a docker container so the php mail function can send from inside the container for development testing. This is using the php:7.3-apache image:

1. Install sendmail (apt install sendmail)
2. Add {docker.ip} {docker.hostname}.localdomain {docker.hostname} to the host's hosts file.
3. Add 127.0.0.1 {docker.hostname}.localdomain localhost to the container's hosts file
4. Create the file /usr/local/etc/php/conf.d/sendmail.ini and add a single line sendmail_path=/usr/sbin/sendmail -t -i
5. Run service sendmail start from inside the container
6. Restart apache, service apache2 graceful

Better yet bake this into the Dockerfile and docker-compose.

External References

• Butler, Tom. How to get sendmail working in docker PHP, Tom Butler's programming blog. Retrieved 2020-10-23.
• stuartz-VernonCo. mail() does not work out of the box, Github docker-library/php. Retrieved 2020-10-23.

Linked References

• linux
  
  • [[PHP Sendmail in Docker]]
• php-best-practices
  
  • [[PHP Sendmail in Docker]]