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feat!: DKIM verifier (#35)

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* 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>
This commit is contained in:
Jagoda Estera Ślązak
2026-08-18 12:21:27 +02:00
committed by missytake
parent dc97e85ebe
commit 23074f0898
12 changed files with 2072 additions and 40 deletions
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filtermail/Cargo.toml
+4
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@@ -19,6 +19,10 @@ mailparse = "0.16.1"
log = "0.4.29"
env_logger = "0.11.9"
governor = "0.10.4"
viadkim = { version = "0.2.0" }
hickory-resolver = "0.25.2"
lru = "0.16.3"
parking_lot = "0.12.5"
[dev-dependencies]
rstest = "0.26.1"