Microsoft Office365 mailboxes use their own flags.
Spam-Mails not flagged with the standard flags (“X-SPam…”)
It would be great if there is a further flag in the emails/filters/postmaster filter : “X-Microsoft-Antispam:” so we can filter spam-mails from this mail-provider.
A greater way would be custom headers like suggested at https://github.com/zammad/zammad/issues/376
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