I received the same message, for the same message number.
I get these every once in a while.  FWIW.

On Mon, Feb 24, 2020 at 06:41:19PM +0100, Peter J. Philipp wrote:
> Hi,
> I got another "bouncing messages from misc@opensmtpd.org" message.  The
> particular message was 4669 that bounced.  Yet I have no record of this in
> my maillog, so I suspect a DNS fault.  
> Feb 24 12:07:04 was the time when the 4668 message came to me so I suspect
> that 4669 came after.  
> I do have a query log for DNS and isolating the fault requires perhaps having
> some logs from opensmtpd.org for the mail to me (if possible).  These logs
> should state if it was a DNS fault in their own wording.
> Every answered DNS packet should be accounted for.  I have a fairly good idea 
> of one of the vultr nameservers that opensmtpd.org uses but there is other 
> addresses like IPv6 addresses that I'm not sure of.  Being given a list of
> the nameservers would help me in the debug as well.
> Would opensmtpd.org be able to provide me the logs so I can attempt tracking
> the problem?
> Best Regards,
> -peter


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