WooCommerce orders seem to be working as expected, but all the email order confirmations are being flagged in Gmail:
Be careful with this message
This may be a spoofed message. The message claims to have been sent from your account, but Mail couldn’t verify the actual source. Avoid clicking links or replying with sensitive information, unless you are sure you actually sent this message. (No need to reset your password, the real sender does not actually have access to your account!)