[Postfix] Remove authed user from header

data/conf/postfix/anonymize_headers.pcre

@@ -1,6 +1,6 @@
 if /^\s*Received:.*Authenticated sender.*\(Postcow\)/
 /^\s*Received:.*Authenticated sender:(.+)/
-  REPLACE Received: from localhost (localhost [127.0.0.1]) (Authenticated sender:$1
+  REPLACE Received: from localhost (localhost [127.0.0.1])
 endif
 /^\s*X-Enigmail/        IGNORE
 /^\s*X-Mailer/          IGNORE