Hello,

Let me know if you upgrade and this fixes the issue. I would be really 
interested to know if this is a bug which has been fixed in a newer version of 
OpenSMTPD.


updating to OpenBSD 6.6 (OpenSMTPD 6.6.0) indeed fixed the issue. Now I receive bounce back messages.

From: mailer-dae...@mx.aloof.de

    Hi!

    This is the MAILER-DAEMON, please DO NOT REPLY to this email.

    An error has occurred while attempting to deliver a message for
    the following list of recipients:

bouncet...@tribulant.com: 550 No such person at this address.

    Below is a copy of the original message:


Reporting-MTA: dns; mx.aloof.de

Final-Recipient: rfc822; bouncet...@tribulant.com
Action: failed
Status: 5.0.0

...

The maillog still has the from=<> thing though.
May 10 21:24:29 o3 smtpd[79692]: 23da0fd0c56b2c65 smtp envelope evpid=a6a961ff5fbfaf7b from=<> to=<foo...@aloof.de>

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