/^\s*Received: from __hostname__/     OK
/^\s*Received:/                           IGNORE
/^From:/ PREPEND User-Agent: Mozilla Thunderbird
/^\s*X-Enigmail/        IGNORE
/^\s*X-Mailer/          IGNORE
/^\s*X-Originating-IP/  IGNORE
/^\s*X-Forward/         IGNORE
/^\s*User-Agent/        IGNORE