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Useful Links

  1. Diff to last release: https://github.com/docker-mailserver/docker-mailserver/compare/v15.1.0...v16.0.0
  2. Our Changelog

What's Changed

[!WARNING]

This release updates the base image from Debian 12 to Debian 13 - expect major breaking changes in case you run custom configs - take your time to plan the update thoroughly!

This release updates the base image from Debian 12 to Debian 13. Hence, all components - Postfix, Dovecot, Fail2Ban, Rspamd, Amavis, ... - received updates. Many of these updates contain breaking changes. We urge you to consult our changelog and read through the details!

The next release will be focusing on bug fixes and housekeeping.

Merged Pull Requests

 * chore: fix various typos across codebase by @JamBalaya56562 in https://github.com/docker-mailserver/docker-mailserver/pull/4552 * ci: update & streamline GH Actions runner images by @JamBalaya56562 in https://github.com/docker-mailserver/docker-mailserver/pull/4553 * chore: Remove Pyzor + Razor packages by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4548 * chore: update externally installed software by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4557 * chore: `apt` - Migrate format from `.list` to `.sources` (DEB822) by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4556 * chore(deps): Bump actions/checkout from 4 to 5 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4560 * Delete user without prompt but keep mailbox data by @dano19 in https://github.com/docker-mailserver/docker-mailserver/pull/4565 * chore(deps): Bump actions/stale from 9 to 10 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4566 * fix: Postfix: `disable_dns_lookups` => `smtp_dns_support_level` by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4568 * fix: RSPAMD_LEARN with mbsync by @l4l4l4l4 in https://github.com/docker-mailserver/docker-mailserver/pull/4569 * docs: Proxy Protocol share `postscreen_cache_map` by @polarathene in https://github.com/docker-mailserver/docker-mailserver/pull/4571 * tests: Temoporary fix for LDAP via Bitnami Legacy by @polarathene in https://github.com/docker-mailserver/docker-mailserver/pull/4583 * chore(deps): Bump anchore/scan-action from 6.5.1 to 7.0.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4573 * fix: Prevent logs leaking into config files (`FETCHMAIL_PARALLEL=1`) by @lkwg82 in https://github.com/docker-mailserver/docker-mailserver/pull/4586 * chore: Revise inline docs for Fetchmail by @polarathene in https://github.com/docker-mailserver/docker-mailserver/pull/4587 * fix: `accounts.sh` - Support first valid local account by @polarathene in https://github.com/docker-mailserver/docker-mailserver/pull/4581 * chore(deps): Bump github/codeql-action from 3 to 4 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4589 * chore(deps): Bump anchore/scan-action from 7.0.0 to 7.0.2 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4591 * chore(deps): Bump anchore/scan-action from 7.0.2 to 7.1.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4595 * chore(deps): Bump actions/upload-artifact from 4 to 5 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4597 * chore(deps): Bump actions/download-artifact from 5 to 6 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4596 * chore(deps): Bump docker/setup-qemu-action from 3.6.0 to 3.7.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4603 * chore(deps): Bump docker/metadata-action from 5.8.0 to 5.9.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4602 * ci: Require bug reports provide disclosure for AI usage by @polarathene in https://github.com/docker-mailserver/docker-mailserver/pull/4605 * tests: fix _get_container_ip for docker 29.0 by @ap-wtioit in https://github.com/docker-mailserver/docker-mailserver/pull/4606 * chore(deps): Bump actions/checkout from 5 to 6 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4609 * chore(deps): Bump anchore/scan-action from 7.1.0 to 7.2.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4608 * chore(deps): Bump anchore/scan-action from 7.2.0 to 7.2.1 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4614 * chore(deps): Bump docker/metadata-action from 5.9.0 to 5.10.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4613 * docs: Rspamd ARC section align private key filename with `setup config dkim` by @aymanbagabas in https://github.com/docker-mailserver/docker-mailserver/pull/4616 * chore(deps): Bump anchore/scan-action from 7.2.1 to 7.2.2 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4621 * chore(deps): Bump actions/cache from 4 to 5 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4619 * chore(deps): Bump actions/download-artifact from 6 to 7 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4620 * chore(deps): Bump actions/upload-artifact from 5 to 6 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4618 * fix: LDAP - Enable `check-for-changes.sh` support by @FDHoho007 in https://github.com/docker-mailserver/docker-mailserver/pull/4627 * chore(deps): Bump docker/setup-buildx-action from 3.11.1 to 3.12.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4628 * fix: Reload the `rspamd` service instead of restarting it by @scristian71 in https://github.com/docker-mailserver/docker-mailserver/pull/4632 * chore(deps): Bump anchore/scan-action from 7.2.2 to 7.2.3 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4636 * docs: Revise `watchtower` page and adapt to community fork by @polarathene in https://github.com/docker-mailserver/docker-mailserver/pull/4641 * chore(deps): Bump anchore/scan-action from 7.2.3 to 7.3.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4650 * chore(deps): Bump anchore/scan-action from 7.3.0 to 7.3.1 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4655 * chore(deps): Bump anchore/scan-action from 7.3.1 to 7.3.2 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4662 * docs(rspamd): Revise DNSBL advice with example + minor tweaks by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4661 * chore: Improve clarity of `SSL_TYPE=self-signed` error message (missing files) by @georglauterbach with @Copilot in https://github.com/docker-mailserver/docker-mailserver/pull/4658 * chore(deps): Bump docker/build-push-action from 6.18.0 to 6.19.2 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4665 * chore(deps): Bump actions/download-artifact from 7 to 8 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4671 * chore(deps): Bump actions/upload-artifact from 6 to 7 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4672 * docs: getmail - Update getmail xoauth example links by @Nailik in https://github.com/docker-mailserver/docker-mailserver/pull/4673 * chore(deps): Bump docker/login-action from 3 to 4 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4681 * chore(deps): Bump docker/setup-qemu-action from 3.7.0 to 4.0.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4679 * chore(deps): Bump docker/setup-buildx-action from 3.12.0 to 4.0.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4677 * chore(deps): Bump docker/metadata-action from 5.10.0 to 6.0.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4680 * chore(deps): Bump docker/build-push-action from 6.19.2 to 7.0.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4678 * chore(deps): Bump marocchino/sticky-pull-request-comment from 2 to 3 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4683 * chore(deps): Bump anchore/scan-action from 7.3.2 to 7.4.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4686 * fix: remove `expand_keys = true` from Rspamd configuration by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4689 * chore: update tools we fetch from GitHub by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4692 * chore(deps): Bump docker/build-push-action from 7.0.0 to 7.1.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4694 * docs: DKIM - Include command to restart DMS properly by @fawazahmed0 in https://github.com/docker-mailserver/docker-mailserver/pull/4698 * fix: `Dockerfile` - Build `dovecot-fts-xapian` package from debian sources by @ap-wtioit in https://github.com/docker-mailserver/docker-mailserver/pull/4700 * fix: Write `ENABLE_MTA_STS` to `/etc/dms-settings` by @polarathene in https://github.com/docker-mailserver/docker-mailserver/pull/4707 * chore(deps): Bump docker/metadata-action from 6.0.0 to 6.1.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4712 * chore(deps): Bump docker/setup-buildx-action from 4.0.0 to 4.1.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4710 * chore(deps): Bump docker/build-push-action from 7.1.0 to 7.2.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4711 * chore(deps): Bump peaceiris/actions-gh-pages from 4.0.0 to 4.1.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4704 * chore(deps): Bump docker/setup-qemu-action from 4.0.0 to 4.1.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4715 * fix(pflogsumm): Prevent incorrect stats when log retention is > 1 year by @piwai in https://github.com/docker-mailserver/docker-mailserver/pull/4709 * chore(deps): Bump nwtgck/actions-netlify from 3.0 to 4.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4721 * feat: add `dms-healthcheck` script for container health checks by @radicand in https://github.com/docker-mailserver/docker-mailserver/pull/4706 * chore(deps): Bump actions/checkout from 6 to 7 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4723 * chore(deps): Bump actions/cache from 5 to 6 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4725 * docs: Correctly describe how `postfix-master.cf` is processed by @brakhane in https://github.com/docker-mailserver/docker-mailserver/pull/4727 * chore(deps): Bump docker/build-push-action from 7.2.0 to 7.3.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4730 * chore(deps): Bump docker/setup-qemu-action from 4.1.0 to 4.2.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4729 * chore(deps): Bump docker/metadata-action from 6.1.0 to 6.2.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4731 * chore(deps): Bump docker/setup-buildx-action from 4.1.0 to 4.2.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4732 * fix(pflogsumm): simplify and process necessary files only by @piwai in https://github.com/docker-mailserver/docker-mailserver/pull/4722 * Fix broken/defunct fail2ban link by @traverseda in https://github.com/docker-mailserver/docker-mailserver/pull/4736 * chore(deps): Bump actions/stale from 10 to 11 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4738 * chore(deps): Bump github/codeql-action from 4 to 4.37.4 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4739 * chore: update base image from Debian 12 to Debian 13 by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4536 * chore(deps): Bump github/codeql-action from 4.37.4 to 4.37.8 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4749 * chore(deps): Bump docker/setup-buildx-action from 4.2.0 to 4.3.0 by @dependabot[bot] in https://github.com/docker-mailserver/docker-mailserver/pull/4748 * remove: Diffie-Hellman parameters for Postfix & Dovecot by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4562 * ci: improve CI caching (#4752) by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4753 * chore: update Fail2Ban to 1.1.1 by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4755 * chore: update MkDocs from 9.6 to 9.7 by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4757 * fix: update Dovecot %user handling by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4758 * feat: add `dovecot-flatcurve` to installed packages by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4759 * chore: remove default Dovecot Flatcurve configuration file by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4760 * docs: add Dovecot Flatcurve tutorial by @bocan in https://github.com/docker-mailserver/docker-mailserver/pull/4756 * fix(opendkim): remove stray `<paste>` from `OmitHeaders` by @aripdcem in https://github.com/docker-mailserver/docker-mailserver/pull/4754 * release: v16.0.0 by @georglauterbach in https://github.com/docker-mailserver/docker-mailserver/pull/4761

New Contributors

Full Changelog: https://github.com/docker-mailserver/docker-mailserver/compare/v15.1.0...v16.0.0

Source: README.md, updated 2026-08-30