v0.16.9

QwenLM/Qwen3-VLv0.16.9Jun 16, 2026by github-actions[bot]

AI Summary

A maintenance release for Stalwart Mail Server addressing security and stability issues in JMAP, Sieve, FoundationDB, MTA, and CardDAV modules.

Key Highlights

Added ACME preferred certificate chain support
Fixed JMAP methods leaking IDs of non-shared objects
Fixed Sieve invalid cert handling in http_header function
Fixed MTA message rescheduling/editing persistence issues
Added ACME freshness check when renewing certificates

New Features

ACME preferred certificate chain support
ACME freshness check

Full Release Notes

## [0.16.9] - 2026-06-15

If you are upgrading from v0.16.x, replace the binary (or run `docker pull`). If you are upgrading from v0.15.x and below, please read the [upgrading documentation](https://github.com/stalwartlabs/stalwart/blob/main/UPGRADING/v0_16.md) for more information on how to upgrade from previous versions.

## Added
- ACME: Allow specifying a preferred certificate chain.

## Changed

## Fixed
- JMAP: `*/changes` methods leak ids of non-shared objects (reported by @5ud0er).
- Sieve: Do not allow invalid certs in `http_header` function.
- FoundationDB: Fix read version cache expiration logic.
- MTA: Re-scheduling or editing a queued message reports success but persists nothing for recipients in a non-`default` virtual queue.
- CardDAV: Version requests included in `address-data` are ignored.
- ACME: Add freshness check when renewing certificates.
- Autodiscover v2: Read email address from query parameters.
- Sieve: Do not keep copies of redirected messages when `keep` is not specified.
- Registry: Object ids are parsed as numbers.


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### Check binary attestation [here](https://github.com/stalwartlabs/stalwart/attestations/31329451)