Update cmdeploy/src/cmdeploy/postfix/lmtp_header_cleanup

Co-authored-by: holger krekel <holger@merlinux.eu>
Aggressive LMTP header cleanup
2026-05-14 18:04:38 +00:00 · 2026-05-13 17:07:08 -07:00 · 2026-05-13 15:24:25 -07:00
1 changed files with 23 additions and 3 deletions
--- a/cmdeploy/src/cmdeploy/postfix/lmtp_header_cleanup
+++ b/cmdeploy/src/cmdeploy/postfix/lmtp_header_cleanup
@@ -1,3 +1,23 @@
-/^DKIM-Signature:/            IGNORE
-/^Authentication-Results:/            IGNORE
-/^Received:/            IGNORE
+# List of headers for incoming messages 
+# that must be retained for functionality and compatibility reasons 
+/^From:/            DUNNO
+/^Message-Id:/      DUNNO
+/^Chat-Is-Post-Message:/      DUNNO
+/^Content-Type:/    DUNNO
+
+# For receiving clear-text messages (still supported in May 2026)
+/^Subject:/         DUNNO
+/^Date:/            DUNNO
+
+# Senders might support Autocrypt 1 but not RFC9788 (Header Protection) 
+/^Autocrypt:/            DUNNO
+
+# SecureJoin V2 protocol headers (for backward compatibility) 
+/^Secure-Join:/             DUNNO
+/^Secure-Join-Invitenumber:/ DUNNO
+/^Secure-Join-Auth:/        DUNNO
+/^Secure-Join-Fingerprint:/ DUNNO
+/^Secure-Join-Group:/       DUNNO
+
+# Ignore all other headers
+/.*/                IGNORE