https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/message-headers-eop-mdo?view=o365-worldwide contains definitions for all of the header fields *except* the SFS field. The SFS field contains nothing but a long list of numerical codes...
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the National Health Service (@nhs.net) and local schools (@xyz.hants.sch.uk). Emails to smaller public businesses using 365 seem to be arriving clean, while the government ones end up in spam.