We periodically receive SPAM from outbound.protection.outlook.com hosts. No worry, they can slip through anyone's filters. But some have an X-Forefront-Antispam-Report header with SFV:SPM which has been said is their indicator of a message they consider to be SPAM. How MS handles them is up to them, of course, but delivering them seems inappropriate. Or is SFV insufficient indication (e.g., weak indicator rather than final judgment)? An additional tag seems to indicate SPAM as well though nothing has been said publicly about it, it merely has "spm" in the pair (MLV:spm).
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