Instead of Outlook, I use a combination of the Thunderbird email client and pull my messages over POP3 (not IMAP, long story) and sort spam based upon an x-header using inbox rules, and I also check mail on my phone. It does this because in EOP, when a message is marked as spam EOP sets the Spam Confidence Level (SCL) MAPI property in Exchange and sets the X-MS-Exchange-Organization-SCL header with the SCL 5, 6, or 9.

I might do that if I were an admin, but the tradeoff is that spammers can just send their messages in plain-text to some end users.

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