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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
2026-02-16 09:50:55 +01:00
committed by GitHub
parent 3bf8395ef6
commit a096d0550f
12 changed files with 2072 additions and 40 deletions
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filtermail/src/outbound.rs
+1 -1
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@@ -55,7 +55,7 @@ impl SmtpHandler for OutgoingBeforeQueueHandler {
Ok(())
}
fn check_data(&self, envelope: &Envelope) -> Result<(), String> {
async fn check_data(&self, envelope: &Envelope) -> Result<(), String> {
log::debug!("Processing DATA message from {}", envelope.mail_from);
let message = match parse_mail(&envelope.data) {