550 5.7.0 [D1] Message rejected due to content policy

Since the 11th of January, we keep getting this message on all WooCommerse automatic emails for new orders, and no mail is sent.

550 5.7.0 [D1] Message rejected due to content policy (e7b7be19-9b28-11ed-bf2c-d128b9a057af) SFH

But when we go into the mail log and re-send the message it is being sent correctly, without error.

The page I need help with: [log in to see the link]

 

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