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boky-postfix is an open-source Mail Transfer Agent that reliably sends and receives email. With Rspamd integration, it uses Rspamd’s built-in DKIM signing module to cryptographically sign outgoing emails, simplifying mail authentication and improving deliverability
Chainguard Containers are regularly-updated, secure-by-default container images.
For those with access, this container image is available on cgr.dev
:
Be sure to replace the ORGANIZATION
placeholder with the name used for your organization's private repository within the Chainguard Registry.
Chainguard's boky-postfix
container image is comparable to the boky/postfix image on Docker Hub, with the following differences:
rspamadm dkim_keygen
and volume-mounted for persistence across container restarts.DKIM_SELECTOR
and DKIM_AUTOGENERATE
environment variables are not supported. Rspamd uses static, pre-generated keys with config-based paths, unlike OpenDKIM's dynamic, file-based key generation via environment variables.boky-postfix
features a stripped down, minimal designRun the Postfix image with gmail SMTP relay:
Check if all services are running:
Check mail queue:
For DKIM key generation, it follows rspamd's security model of manual key management, ensuring proper key control and DNS coordination.
rspamadm dkim_keygen
command/var/lib/rspamd/dkim/
directoryFor production use:
Generate keys once and mount them:
rspamadm dkim_keygen
-v /host/path/dkim:/var/lib/rspamddkim
After generating keys, you must manually add the public key to your domain's DNS as a TXT record. The DNS record format is provided by the rspamadm dkim_keygen
command output. For more information, check the rspamd's DKIM signing module documentation
Chainguard's free tier of Starter container images are built with Wolfi, our minimal Linux undistro.
All other Chainguard Containers are built with Chainguard OS, Chainguard's minimal Linux operating system designed to produce container images that meet the requirements of a more secure software supply chain.
The main features of Chainguard Containers include:
For cases where you need container images with shells and package managers to build or debug, most Chainguard Containers come paired with a development, or -dev
, variant.
In all other cases, including Chainguard Containers tagged as :latest
or with a specific version number, the container images include only an open-source application and its runtime dependencies. These minimal container images typically do not contain a shell or package manager.
Although the -dev
container image variants have similar security features as their more minimal versions, they include additional software that is typically not necessary in production environments. We recommend using multi-stage builds to copy artifacts from the -dev
variant into a more minimal production image.
To improve security, Chainguard Containers include only essential dependencies. Need more packages? Chainguard customers can use Custom Assembly to add packages, either through the Console, chainctl
, or API.
To use Custom Assembly in the Chainguard Console: navigate to the image you'd like to customize in your Organization's list of images, and click on the Customize image button at the top of the page.
Refer to our Chainguard Containers documentation on Chainguard Academy. Chainguard also offers VMs and Libraries — contact us for access.
This software listing is packaged by Chainguard. The trademarks set forth in this offering are owned by their respective companies, and use of them does not imply any affiliation, sponsorship, or endorsement by such companies.
Chainguard container images contain software packages that are direct or transitive dependencies. The following licenses were found in the "latest" tag of this image:
Apache-2.0
Artistic-1.0-Perl
BSD-1-Clause
BSD-2-Clause
BSD-3-Clause
BSD-4-Clause-UC
CC-PDDC
For a complete list of licenses, please refer to this Image's SBOM.
Software license agreement