Your message to the list has the header
Received: from oneyou.mgm51.net (unknown [174.136.99.202]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by mx.mailop.org (Postfix) with ESMTPS id 4KR1t64s9yz8sqQ for <[email protected]>; Sun, 27 Mar 2022 05:44:46 +0200 (CEST)
which implies a DNS resolution failure for 174.136.99.202 which could have caused the reject by an MTA that requires a correspondent MTA to have good DNS.
As of this writing, but perhaps not earlier, 174.136.99.202 has
correct FCrDNS.
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