Hi, This may be old hat to some, but staring at the RFCs (specifically 2821) the only conclusion I see is that Microsoft is (or at least *.outlook.com servers are) violating the format of the Received headers here:
Received: from mta.email.thinkgeek.com (66.231.88.32) by SN1NAM04FT019.mail.protection.outlook.com (10.152.88.152) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P384) id 15.20.675.14 via Frontend Transport; Mon, 16 Apr 2018 16:33:42 +0000 Should that IPv4 literal be enclosed with "[" and "]" tokens, either as ([a.b.c.d]) or (hostname [a.b.c.d])? Thanks in advance, Erwin
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