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OpenSMTPD docker container image

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# OpenSMTPD Docker Container Image

[![Build Status](https://github.com/wodby/opensmtpd/workflows/Build%20docker%20image/badge.svg)](https://github.com/wodby/opensmtpd/actions)
[![Docker Pulls](https://img.shields.io/docker/pulls/wodby/opensmtpd.svg)](https://hub.docker.com/r/wodby/opensmtpd)
[![Docker Stars](https://img.shields.io/docker/stars/wodby/opensmtpd.svg)](https://hub.docker.com/r/wodby/opensmtpd)

## Docker images

❗️For better reliability we release images with stability tags (`wodby/opensmtpd:7-X.X.X`) which correspond to [git tags](https://github.com/wodby/opensmtpd/releases). We strongly recommend using images only with stability tags.

Overview:

- All images are based on Alpine Linux
- Base image: [wodby/alpine](https://github.com/wodby/alpine)
- [GitHub actions builds](https://github.com/wodby/opensmtpd/actions) 
- [Docker Hub](https://hub.docker.com/r/wodby/opensmtpd)

Supported tags and respective `Dockerfile` links:

- `7`, `7.8`, `latest` [_(Dockerfile)_](https://github.com/wodby/opensmtpd/tree/master/Dockerfile)

All images built for `linux/amd64` and `linux/arm64`

## Environment variables

| Variable                     | Default Value | Description                            |
|------------------------------|---------------|----------------------------------------|
| `OPENSMTPD_BOUNCE_WARN`      | `1h, 6h, 2d`  |                                        |
| `OPENSMTPD_EXPIRE`           | `4d`          |                                        |
| `OPENSMTPD_MAX_MESSAGE_SIZE` | `35M`         |                                        |
| `RELAY_HOST`                 |               |                                        |
| `RELAY_PROTO`                | `smtp+tls`    |                                        |
| `RELAY_USER`                 |               |                                        |
| `RELAY_USER_FILE`            |               | A file where the user can be found     |
| `RELAY_PASSWORD`             |               |                                        |
| `RELAY_PASSWORD_FILE`        |               | A file where the password can be found |
| `RELAY_PORT`                 | `587`         |                                        |

The XXX_FILE environment variables allow to put the authentication
credentials in files rather than environment variables directly.
This is typically used to deploy the authentication password using
`docker secret`.

If you store the password in `docker secret`, e.g.

```
$ echo 'my secret' | docker secret create smtp_relay_password -
```

then you can use it setting the `RELAY_PASSWORD_FILE` environment
variable in your container like:

```
RELAY_PASSWORD_FILE=/run/secrets/smtp_relay_password
```

Note that you cannot specify both the `XXX` and `XXX_FILE` environment
variables.

## Orchestration actions

Usage:
```
make COMMAND [params ...]

commands:
    check-ready [host max_try wait_seconds delay_seconds]
 
default params values:
    host localhost
    max_try 1
    wait_seconds 1
    delay_seconds 0
```

## Deployment

Deploy OpenSMTPD to your own server via [![Wodby](https://www.google.com/s2/favicons?domain=wodby.com) Wodby](https://wodby.com/stacks/opensmtpd).

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