Sorry, what section of 2821? With all the different styles of Received: headers out there (Qmail comes to mind…), I wasn’t aware that there was in fact a single standard on the format. I mean, I really love the (xxxx [n.n.n.n]) structure and all, but … If you could point me to a MUST reference, I’d be grateful.
Aloha, Michael. -- Michael J Wise Microsoft Corporation| Spam Analysis "Your Spam Specimen Has Been Processed." Got the Junk Mail Reporting Tool<http://www.microsoft.com/en-us/download/details.aspx?id=18275> ? From: mailop <mailop-boun...@mailop.org> On Behalf Of Erwin Sent: Wednesday, April 18, 2018 2:41 PM To: mailop <mailop@mailop.org> Subject: [mailop] Received header address information 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<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Foutlook.com&data=02%7C01%7Cmichael.wise%40microsoft.com%7C82c6a24e30414114a25508d5a5765c7b%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636596850158074661&sdata=UT6h9frOHbZ76bjwYqCtsS704%2B7hfWyw269vgWCHQmU%3D&reserved=0> servers are) violating the format of the Received headers here: Received: from mta.email.thinkgeek.com<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmta.email.thinkgeek.com&data=02%7C01%7Cmichael.wise%40microsoft.com%7C82c6a24e30414114a25508d5a5765c7b%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636596850158084665&sdata=3rTpbpv612yzA%2FwJp57jlbECMZxpc3GSX9ayn1I%2FxBU%3D&reserved=0> (66.231.88.32) by SN1NAM04FT019.mail.protection.outlook.com<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2FSN1NAM04FT019.mail.protection.outlook.com&data=02%7C01%7Cmichael.wise%40microsoft.com%7C82c6a24e30414114a25508d5a5765c7b%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636596850158084665&sdata=MKriM7d6Wfg6pvQhxU29pkOpz1OqjqaozU5GZwan7qE%3D&reserved=0> (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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