I’m sure their solution of tailing and parsing Postfix log files works well, but I believe the more typical and elegant solution to tracking bounces is to send

I’m sure their solution of tailing and parsing Postfix log files works well, but I believe the more typical and elegant solution to tracking bounces is to send every email with a with a unique envelope sender address that identifies that particular email, which makes it easier to collect bounces without relying on correct parsing of an MTA log file.