> Do you have some front-end before your Postfix (for example some UTM device
> that is filtering mail traffic)?

No

> Because the strange rejection message that
> is not generated by Postfix somehow correlates for me with "canceled" in
> your logs.

That's what I thought. Rspamd is connected via milter, but rspamd
didn't reject this

-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netz | Netzwerk-Administration
  Invalidenstraße 120/121 | D-10115 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebra...@charite.de | https://www.charite.de
            
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