Docker Mailcatcher using the latest Alpine Linux
| component | version |
|---|---|
| Alpine Linux | 3.15 |
| MailCatcher | 0.8.1 |
| Ruby | 3.0.3-r0 |
| SQlite | 3-1.3.13 |
Ruby & SQlite versions may differ as they are updated during the installation of the image.
Run docker pull stpaquet/alpinemailcatcher from Terminal to install the image on your computer.
Once the installation has completed with success you can run the following command docker images and you should see the following output (with more or less line depending on the number of containers already installed on your computer)
Docker users using 2FA might encounter the following error message: Error response from daemon: Head "https://registry-1.docker.io/v2/stpaquet/alpinemailcatcher/manifests/latest": unauthorized: please use personal access token to login
In that case they must follow the following procedure to set up an access token..
Once the access token created, they must login to their docker machine: docker login --username <username> and enter their access token when prompted.
There are different options when it comes to running this images. Here are our most favorite ones:
docker run --rm -p 1080:1080 -p 1025:1025 --name mailcatcher stpaquet/alpinemailcatcher
docker run -d -p 1080:1080 -p 1025:1025 --name mailcatcher stpaquet/alpinemailcatcher
The default value is 50, but this value can be changed when launching the docker image using the following command: docker run -d -p 1080:1080 -p 1025:1025 -e MAIL_LIMIT=60 --name mailcatcher stpaquet/alpinemailcatcher
In the above example the value is raised to 60.
As this value is defined as an environment variable it can be modified in different ways, including using a docker-compose file.
All of the above variables can be changed at run time using the -e flag or included in a docker-compose file.
In this version you cannot change the ports being used in the image. However, you can change the port translation.
If ports 1080 or 1025 are used by an other application or service on your computer you can change these values the following way:
docker run -d -p 3080:1080 -p 3025:1025 --name mailcatcher
Just point your favorite web browser to MailCatcher image IP address if on Linux or to docker-machine IP address if on a Mac or Windows PC.
On Mac and Windows you do not run docker directly, but through docker-machine. This implies that you will not access MailCatcher web interface using the IP address of the container, but the docker-machine one.
To get the IP address of your docker-machine run the following command:
docker-machine env dev (assuming your docker machine is named dev
export DOCKER_TLS_VERIFY="1"
export DOCKER_HOST="tcp://192.168.99.100:2376"
export DOCKER_CERT_PATH="/Users/username/.docker/machine/machines/dev"
export DOCKER_MACHINE_NAME="dev"
In this case, to access MailCatcher web interface you need to enter http://192.168.99.100:1080
When using docker-machine do not forget to run eval $(docker-machine env dev) to configure your shell. If your shell is not properly configured you will not be able to run docker commands. Thus installing or running MailCatcher using this docker image will not work.
Newer versions of docker desktop may not require the above when properly set up on a Mac as they properly bind to the localhost address of the machine being used.
Add the following lines to your environments/development.rb to redirect your ActionMailer directly to MailCatcher:
config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = { :address => '127.0.0.1', :port => 1025 }
config.action_mailer.raise_delivery_errors = false
Make sure that the port and address are matching the one of your MailCatcher image, or docker-machine if you are on a Mac or PC running Windows.
MailCatcher is running in foreground mode. This does not change MailCatcher behavior and performances are not affected.
| Version | Date | Notes |
|---|---|---|
| 1.0 | 2017-08-07 | Initial release |
| 1.1 | 2017-08-08 | |
| 1.2 | 2022-02-27 | Updated to Mailcatcher 0.8 Limit to 50 the number of emails saved in mailcatcher |
| 1.3 | 2022-02-27 | Enable users to change mail-limit value at run time |
| 1.4 | 2022-02-28 | Upgrading to Mailcatcher 0.8.1 |
| 1.5 | 2022-03-03 | Tighter control over the environment |
Fork and pull your changes!
To build run docker build -t stpaquet/alpinemailcatcher
git clone [email protected]:spaquet/alpinemailcatcher.git
cd alpinemailcatcher
docker run --rm -it -p 1080:1080 -p 1025:1025 --name mailcatcher $(docker build -q .)
Our MailCatecher on Alpine can be found on our public DockerHub
Github: https://github.com/sj26/mailcatcher
Website: https://mailcatcher.me/
Website: https://alpinelinux.org/
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent