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
if /^\s*Received: from.* \(.*dovecot-mailcow.*mailcow-network.*\).*\(Postcow\)/
/^Received: from.* (.*|\n.*)\((.+) (.+)\)\s+by (.+) \(Postcow\) with (.*)/
  REPLACE Received: from sieve (sieve $3) by $4 (Postcow) with $5
endif
if /^\s*Received: from.* \(.*rspamd-mailcow.*mailcow-network.*\).*\(Postcow\)/
/^Received: from.* (.*|\n.*)\((.+) (.+)\)\s+by (.+) \(Postcow\) with (.*)/
  REPLACE Received: from rspamd (rspamd $3) by $4 (Postcow) with $5
endif
/^\s*X-Enigmail/        IGNORE
# Not removing Mailer by default, might be signed
#/^\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