Was the message sent to a moderated group? If so, that looks expected if someone already approved the message
https://techcommunity.microsoft.com/t5/exchange-team-blog/demystifying-moderation/ba-p/2566197
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We are getting mail from the system mailbox. we have Exchange server 2016 with Exchange hybrid. Screenshots is given below-
Was the message sent to a moderated group? If so, that looks expected if someone already approved the message
https://techcommunity.microsoft.com/t5/exchange-team-blog/demystifying-moderation/ba-p/2566197