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by Krei-se 262 days ago
No, that's because your relay overwrites part of the header which makes dkim strict break. Change to relaxed or don't modify the header on your relay.

Outlook business will accept your mail, Outlook private may filter, but the rates fluctuate so heavy i suspect its rules based on user behaiviour/interests. I dono, cant have both spamfree inbox and 0 false positives.