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OpenSMTPD Docker Container Image

Docker images

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

Overview:

All images based on Alpine Linux
Base image: wodby/alpine
GitHub actions builds
Docker Hub

Supported tags and respective Dockerfile links:

7, 7.5, latest (Dockerfile)

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 Wodby.