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fix: advertise 8BITMIME to prevent conversion after DKIM signing (#149)

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for bounces postfix sets Content-Transfer-Encoding: 8bit
which causes a quoted-printable conversion when filtermail SMTP does not offer 8BITMIME,
which in turn breaks DKIM verification.
This commit is contained in:
holger krekel
2026-05-12 06:56:11 +02:00
committed by GitHub
parent 5295d175d6
commit 36921dd29f
1 changed files with 1 additions and 1 deletions
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filtermail/src/smtp_server.rs
+1 -1
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@@ -121,7 +121,7 @@ where
|| cmd.to_uppercase().starts_with("LHLO")
{
writer
.write_all(b"250-filtermail\r\n250-XFORWARD ADDR\r\n250 OK\r\n")
.write_all(b"250-filtermail\r\n250-XFORWARD ADDR\r\n250-8BITMIME\r\n250 OK\r\n")
.await?;
writer.flush().await?;
} else if cmd.to_uppercase().starts_with("MAIL FROM:<>") {