This article explains how to configure catch-all in Microsoft 365®?
As per Wikipedia– A catch-all filter will “catch all” of the emails addressed to the domain that do not exist in the mail server – this can help avoid losing emails due to misspelling.
As per TechNet– Catch all mailbox is a mailbox which receives/catches all
the mails sent to non-existent mailbox in an organization. It allows you to receive email sent to your domain that might be misaddressed or misspelled
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