if /^\s*Received:.*Authenticated sender.*\(Postcow\)/ #/^Received: from .*? \([\w-.]* \[.*?\]\)\s+\(Authenticated sender: (.+)\)\s+by.+\(Postcow\) with (E?SMTPS?A?) id ([A-F0-9]+).+;.*?/ /^Received: from .*? \([\w-.]* \[.*?\]\)(.*|\n.*)\(Authenticated sender: (.+)\)\s+by.+\(Postcow\) with (.*)/ REPLACE Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with $3 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