# List of headers for incoming messages 
# that must be retained for functionality and compatibility reasons 
/^From:/            DUNNO
/^Message-Id:/      DUNNO
/^Chat-/            DUNNO
/^Content-Type:/    DUNNO

# For receiving clear-text messages (still supported in May 2026)
/^Subject:/         DUNNO
/^Date:/            DUNNO
/^To:/              DUNNO
/^CC:/              DUNNO
/^References:/      DUNNO
/^In-Reply-To:/     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
