The postfix/smtp "message status" log line sometimes has an external "orig_to=<>" to "to=<>" and has to be supported

I have noticed some log lines have the format:

May  5 00:00:00 mail postfix/smtp[17709]: AB5501855DA0: to=<to@mail.com>, orig_to=<orig_to@mail.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.87, delays=0.68/0.01/0/0.18, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 2F01D1855DB2)

The extra component, "orig_to=<>" is currently making this line fail to be parsed.