mailcow/data/conf/postfix/anonymize_headers.pcre

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if /^\s*Received:.*Authenticated sender.*\(Postcow\)/
/^\s*Received:.*Authenticated sender:(.+)/
REPLACE Received: from localhost (localhost [127.0.0.1])
endif
/^\s*X-Enigmail/ IGNORE
/^\s*X-Mailer/ IGNORE
/^\s*X-Originating-IP/ IGNORE
/^\s*X-Forward/ IGNORE
# Not removing UA by default, might be signed
#/^\s*User-Agent/ IGNORE