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Jagoda Estera Ślązak e9fdbf39d4 feat!: Remove IP verification for domain-literals (#90) 
BREAKING CHANGE: messages using domain-literal
  addresses don't require to match the origin
  SMTP connection IP anymore.

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:28 +02:00
Jagoda Estera Ślązak a4dacc2768 docs(readme): Improve README.md (#88) 
Fixes #85

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:28 +02:00
Jagoda Estera Ślązak c8e727c03c docs(readme): Clarify licensing of the binaries 
Co-authored-by: holger krekel  <holger@merlinux.eu>
 2026-08-18 12:21:28 +02:00
Jagoda Ślązak 3b4e91f492 docs(readme): Fix license link 
Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:28 +02:00
dependabot[bot] 44ddab8f38 chore(deps): Bump tokio from 1.49.0 to 1.50.0 (#86) 
Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.49.0 to 1.50.0.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/compare/tokio-1.49.0...tokio-1.50.0)

---
updated-dependencies:
- dependency-name: tokio
  dependency-version: 1.50.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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 2026-08-18 12:21:28 +02:00
dependabot[bot] 8187796e1d chore(deps): Bump taiki-e/install-action from 2.68.13 to 2.68.20 (#87) 
Bumps [taiki-e/install-action](https://github.com/taiki-e/install-action) from 2.68.13 to 2.68.20.
- [Release notes](https://github.com/taiki-e/install-action/releases)
- [Changelog](https://github.com/taiki-e/install-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/taiki-e/install-action/compare/a3324fb0eb94b8230ec968c3389c1b7929fc2f3b...4a136ceac97fe29b942ff3b6c749a46c7950d853)

---
updated-dependencies:
- dependency-name: taiki-e/install-action
  dependency-version: 2.68.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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 2026-08-18 12:21:28 +02:00
Andrey 0xdc09 199434e602 refactor: use enum for mode cli arg (#83) 2026-08-18 12:21:28 +02:00
dependabot[bot] 721280867a chore(deps): Bump actions/download-artifact from 7.0.0 to 8.0.0 (#81) 
Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 7.0.0 to 8.0.0.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/37930b1c2abaa49bbe596cd826c3c89aef350131...70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: 8.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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 2026-08-18 12:21:28 +02:00
dependabot[bot] b2ab18476a chore(deps): Bump taiki-e/install-action from 2.68.5 to 2.68.13 (#82) 
Bumps [taiki-e/install-action](https://github.com/taiki-e/install-action) from 2.68.5 to 2.68.13.
- [Release notes](https://github.com/taiki-e/install-action/releases)
- [Changelog](https://github.com/taiki-e/install-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/taiki-e/install-action/compare/71b48393496777ee11188c07a34d48b048a985cd...a3324fb0eb94b8230ec968c3389c1b7929fc2f3b)

---
updated-dependencies:
- dependency-name: taiki-e/install-action
  dependency-version: 2.68.13
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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 2026-08-18 12:21:28 +02:00
dependabot[bot] de47a627fd chore(deps): Bump actions/upload-artifact from 6.0.0 to 7.0.0 (#80) 
Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6.0.0 to 7.0.0.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/b7c566a772e6b6bfb58ed0dc250532a479d7789f...bbbca2ddaa5d8feaa63e36b76fdaad77386f024f)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: 7.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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 2026-08-18 12:21:28 +02:00
Jagoda Estera Ślązak 07e807bdfe chore(ci): Fix binary publish job (#79) 2026-08-18 12:21:28 +02:00
Jagoda Estera Ślązak 62ce8d474d chore(release): prepare for 0.5.2 (#78) 
Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:28 +02:00
Jagoda Estera Ślązak 842e0baa61 chore(ci): Add missing Zig dependency (#77) 
Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:28 +02:00
Jagoda Estera ?l?zak eea39c7bab chore(ci): Build and upload binaries in CI (#76) 
Use zigbuild directly instead of cargo-dist,
as cargo-dist doesn't suit our needs well
(e.g. uploading binaries at top level).

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:28 +02:00
Jagoda Estera Ślązak b17900bca1 chore: Bump cargo-dist (#73) 
Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:28 +02:00
Jagoda Estera Ślązak 93c0c3a891 feat: Check incoming email return address (#72) 
If the MAIL FROM doesn't match the From header,
we do not reject the mail, as this can be caused
by e.g. SRS forwarding. Instead, we reset the envelope
address, so it is reinjected as `MAIL FROM:<>`
to prevent sending a bounce message.

Closes #67

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:28 +02:00
Jagoda Estera Ślązak b05164a86e refactor: Check if email is encrypted before verifying DKIM (#71) 
This way we won't be logging DKIM rejections on messages that
would be rejected anyway due to not being encrypted.

Fixes #69

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:28 +02:00
Jagoda Estera Ślązak d64d546582 fix(logs): Log correct address for outbound messages (#70) 
Fixes #68

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak 9cf0bba7ed chore(release): prepare for 0.5.1 (#65) 
Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak 4e274ae280 fix(logs): Log From address instead of envelope MAIL FROM. (#66) 
Fixes #64

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak 8fefc1cc94 fix(dkim): Accept TXT records with escaped quotes (#61) 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak 83aa54bb82 fix(smtp): Properly handle bounce messages (#63) 
Closes #58

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
dependabot[bot] 7f6215b875 chore(deps): Bump taiki-e/install-action from 2.67.30 to 2.68.5 (#57) 
Bumps [taiki-e/install-action](https://github.com/taiki-e/install-action) from 2.67.30 to 2.68.5.
- [Release notes](https://github.com/taiki-e/install-action/releases)
- [Changelog](https://github.com/taiki-e/install-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/taiki-e/install-action/compare/288875dd3d64326724fa6d9593062d9f8ba0b131...71b48393496777ee11188c07a34d48b048a985cd)

---
updated-dependencies:
- dependency-name: taiki-e/install-action
  dependency-version: 2.68.5
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak 9d22b2b79a fix(dkim): Accept TXT records with no v= tag (#62) 
Cache at most 3 TXT records instead of trying to find one that includes `DKIM`.

Closes #59

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak 60ce20d3aa chore(release): prepare for 0.5.0 (#56) 
Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak d823b28390 feat: Save rejected messages to /tmp (#55) 2026-08-18 12:21:27 +02:00
l 4fde0d5c5f refactor: do not copy the mail in memory for DKIM verification (#54) 
`String::from_utf8_lossy` always copies the data
for the case when it needs to replace invalid UTF-8,
but we don't want invalid UTF-8 anyway as replacing
invalid UTF-8 characters will break DKIM signature.
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak 5b24879573 fix(dkim): Make simple header canonicalization work properly (#53) 
Previously header parsing caused leading whitespaces to be
trimmed in HeaderBody, which resulted in incorrect simple
header canonicalization.

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak d8681d237f chore(release): prepare for 0.4.1 (#51) 
Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak 223fa3c67b chore(tests): Add a way to disable DKIM for tests (#50) 
Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak 1192531afc chore(release): prepare for 0.4.0 (#49) 
Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak 3dfac56db9 feat: Support addresses using domain literals (#42) 
If the incoming email comes from address that uses
domain literals `[<ipv4>]` or `[IPv6:<ipv6>]`,
skip DKIM verification and instead check IP
alignment with originating IP from XFORWARD
command.

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak 23074f0898 feat!: DKIM verifier (#35) 
* feat!: DKIM verifier

This implements a DKIM verification as well as a strict
DKIM signature alignment check with domain in `From`
header address.

Caches the retrieved RDATA using in-memory LRU.

BREAKING CHANGE: incoming messages now require DKIM signatures
  aligned to domain of the `From` header address.

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>

* chore(license): License binaries under GPLv3

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>

---------

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak dc97e85ebe chore(release): prepare for 0.3.0 (#45) 
Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
dependabot[bot] d59d1c8f8f chore(deps): Bump dtolnay/rust-toolchain (#46) 
Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from f7ccc83f9ed1e5b9c81d8a67d7ad1a747e22a561 to efa25f7f19611383d5b0ccf2d1c8914531636bf9.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](https://github.com/dtolnay/rust-toolchain/compare/f7ccc83f9ed1e5b9c81d8a67d7ad1a747e22a561...efa25f7f19611383d5b0ccf2d1c8914531636bf9)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-version: efa25f7f19611383d5b0ccf2d1c8914531636bf9
  dependency-type: direct:production
...

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 2026-08-18 12:21:27 +02:00
dependabot[bot] d0891ef3f1 chore(deps): Bump taiki-e/install-action from 2.67.24 to 2.67.30 (#48) 
Bumps [taiki-e/install-action](https://github.com/taiki-e/install-action) from 2.67.24 to 2.67.30.
- [Release notes](https://github.com/taiki-e/install-action/releases)
- [Changelog](https://github.com/taiki-e/install-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/taiki-e/install-action/compare/4573997e3b6c0fbc22f7acab193b00a8a3ca817d...288875dd3d64326724fa6d9593062d9f8ba0b131)

---
updated-dependencies:
- dependency-name: taiki-e/install-action
  dependency-version: 2.67.30
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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 2026-08-18 12:21:27 +02:00
dependabot[bot] 9206fae6d3 chore(deps): Bump env_logger from 0.11.8 to 0.11.9 (#47) 
Bumps [env_logger](https://github.com/rust-cli/env_logger) from 0.11.8 to 0.11.9.
- [Release notes](https://github.com/rust-cli/env_logger/releases)
- [Changelog](https://github.com/rust-cli/env_logger/blob/main/CHANGELOG.md)
- [Commits](https://github.com/rust-cli/env_logger/compare/v0.11.8...v0.11.9)

---
updated-dependencies:
- dependency-name: env_logger
  dependency-version: 0.11.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak 5c603db830 feat: Support legacy, pre-OpenPGP packet format (#44) 
Support legacy packet format for compatibility with GnuPG.

Closes: #43

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
dependabot[bot] 51f5f36478 chore(deps): Bump taiki-e/install-action from 2.67.16 to 2.67.24 (#37) 
Bumps [taiki-e/install-action](https://github.com/taiki-e/install-action) from 2.67.16 to 2.67.24.
- [Release notes](https://github.com/taiki-e/install-action/releases)
- [Changelog](https://github.com/taiki-e/install-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/taiki-e/install-action/compare/a362280ea100b5bb920cf9040c038ce9a50c7943...4573997e3b6c0fbc22f7acab193b00a8a3ca817d)

---
updated-dependencies:
- dependency-name: taiki-e/install-action
  dependency-version: 2.67.24
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak f34642e96c refactor: Use a custom, minimal SMTP client instead of lettre (#33) 
This disables the Nagle's algorithm on re-insertion.

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak 0dfc3fae4e refactor: Remove unnecessary Arc (#36) 
`Arc` around handler configs are not needed,
as they are not shared.

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
dependabot[bot] e7becac980 chore(deps): Bump taiki-e/install-action from 2.67.6 to 2.67.16 (#34) 
Bumps [taiki-e/install-action](https://github.com/taiki-e/install-action) from 2.67.6 to 2.67.16.
- [Release notes](https://github.com/taiki-e/install-action/releases)
- [Changelog](https://github.com/taiki-e/install-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/taiki-e/install-action/compare/8444b4f2165ec93147f3ee41e06495653063ad11...a362280ea100b5bb920cf9040c038ce9a50c7943)

---
updated-dependencies:
- dependency-name: taiki-e/install-action
  dependency-version: 2.67.16
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak ebaa3587a6 chore(dist): Switch to musl targets (#31) 
Ensures filtermail binaries are 100% statically linked.

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak a5b1cada7b chore(release): prepare for 0.2.0 (#30) 
Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak f2941c9807 feat: Configurable rate limiter max burst size (#28) 
Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00
dependabot[bot] f4d9a7e747 chore(deps): Bump taiki-e/install-action from 2.66.7 to 2.67.6 (#24) 
Bumps [taiki-e/install-action](https://github.com/taiki-e/install-action) from 2.66.7 to 2.67.6.
- [Release notes](https://github.com/taiki-e/install-action/releases)
- [Changelog](https://github.com/taiki-e/install-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/taiki-e/install-action/compare/542cebaaed782771e619bd5609d97659d109c492...8444b4f2165ec93147f3ee41e06495653063ad11)

---
updated-dependencies:
- dependency-name: taiki-e/install-action
  dependency-version: 2.67.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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 2026-08-18 12:21:27 +02:00
dependabot[bot] e99f71aadd chore(deps): Bump actions/checkout from 6.0.1 to 6.0.2 (#25) 
Bumps [actions/checkout](https://github.com/actions/checkout) from 6.0.1 to 6.0.2.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/8e8c483db84b4bee98b60c0593521ed34d9990e8...de0fac2e4500dabe0009e67214ff5f5447ce83dd)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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 2026-08-18 12:21:27 +02:00
link2xt 71739d3334 refactor: remove Mutex around rate limiter 
Rate limiter handles all the necessary locking internally.
 2026-08-18 12:21:27 +02:00
link2xt fa762d0cb5 perf: disable Nagle's algorithm and do own buffering on server connections 
I don't know if Postfix as the client disables delayed ACKs,
but if delayed ACKs are enabled, Nagle's algorithm introduces unnecessary delays.
 2026-08-18 12:21:27 +02:00
Jagoda Estera Ślązak 5dc49d20dd chore(release): prepare for 0.1.2 (#22) 
Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>
 2026-08-18 12:21:27 +02:00