Calender Invite Response Issue

[Jonathan Miller]

Hi All,

I'm having an issue with all of our users receiving calendar invite responses from external emails from certain email providers. So far I have had issues reported from gmail.com, icloud.com, and yahoo.com. I have done testing from multiple accounts and have been able to verify this is an issue affecting out whole organization.

When a user in our Office 365 sends a calendar invite to user@gmail.com, the gmail account will get the calendar invite, but when they chose a response it doesn't come back to Office 365. Same with Yahoo and iCloud (possibly more).

I sent a case in to Office 365 support, but they weren't able to help at all after looking into it for a couple weeks.  I haven't been able to come up with anything on my own, so I'm hopeful someone else out there has seen this issue before and can help us out.

Thanks!

Jon

[#2]

Hey Jon,

To look into this further, we are going to need some headers of messages.

Could you perhaps grab the full headers of one of the tests you sent to your own gmail/yahoo/whatever.

There are not enough details for us to tell you why this could be happening at the moment, we will need to dig into some of the details of the actual send path.

Adam

[#3]

I know there have been issues with this when you have a for example google account tied to that same address! And responses from the invited sends them to that calendar instead!

[#4]

Here are the headers from a test message, I just changed the email addresses for privacy.

Delivered-To: User@gmail.com
Received: by 2002:a4a:6508:0:0:0:0:0 with SMTP id y8-v6csp4936501ooc;
        Tue, 9 Oct 2018 07:30:02 -0700 (PDT)
X-Google-Smtp-Source: ACcGV62LlGLnQHjBi/PPnj+0hr2ldB5rsDfWpTmfeX+vWuqc0fjjn02F1wqGHx5HZKYBXuoN68ic
X-Received: by 2002:a9d:6846:: with SMTP id c6mr9311756oto.65.1539095402085;
        Tue, 09 Oct 2018 07:30:02 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1539095402; cv=none;
        d=google.com; s=arc-20160816;
        b=09pFtaF9feoMLfaQdMPlmMohFEZ8B9YZWXtBI2uCyTP91KUTWT6skXP8a9DgW1AH8E
         f5q7kZl5n35hY5qbBNL8RpN/Rydvm2gKScnvcIN32IyMGNv9wHjiuKV8aQnzBi+Ogm4n
         KyBNrp3Uu0qnQcJtt2/sCx60YDhQRcF2VZppB4LN1wRjIFXqkzzTW3fpNUlLQn5lUmW8
         MXGY7uR1jmfpgOjtL4ig6Oo/UIZfXc4P4Jw4oxIIL85VvYmEk3q10yVDdkjd7Yhgoo29
         /RKwXeF+W5IX3Qn0I4BTVufgQ0/s5UxSj9XlELJ/FHWHlTwAwinGCg6CJRci5/xU3Kti
         HiiQ==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=mime-version:spamdiagnosticmetadata:spamdiagnosticoutput
         :content-language:accept-language:message-id:date:thread-index
         :thread-topic:subject:to:from:dkim-signature;
        bh=zBWNQdpu/zr9oRtS9Wwd49yUXMaOcbIG/Unsiw8Y7GA=;
        b=SEN7QmmO7amoNzLS+PLrBDI98gHXm9S4YCRBSAkXrj5sk0LotVzYMzyi3SvfZ3cxtM
         BHxGKFR+UgXcwqjKjbBZOL7HLjxJlB8TpvHpHMMeZOKXK2jtpBLC2hIY7ELFSKF9nhyE
         l7Zyy6io7VGmbPc3N+4vNm1HPrj3rRWuDffvHfpZY4R9u9s0ILeYfaHWu7vEzLRef2WR
         ubCF+RaSclvu9lBUQoOObsu0v+zhShRmmPtS0LMNLXz1OhoCB6MxTmt6I/8GoujAXKJa
         LGqrR8/MqhWn2MSzwyAUzUmss5WlSKYMuEDIy3XeK73qc2mXQKUDP1JgplToG6zj8zWz
         1Vgw==
ARC-Authentication-Results: i=1; mx.google.com;
       dkim=pass header.i=@office365domaincom.onmicrosoft.com header.s=selector1-office365domain.com header.b=WS4RAZEE;
       spf=pass (google.com: domain of User@office365domain.com designates 104.47.34.69 as permitted sender) smtp.mailfrom=User@office365domain.com
Return-Path: <User@office365domain.com>
Received: from NAM01-BY2-obe.outbound.protection.outlook.com (mail-by2nam01on0069.outbound.protection.outlook.com. [104.47.34.69])
        by mx.google.com with ESMTPS id r13-v6si4179186oic.86.2018.10.09.07.30.01
        for <User@gmail.com>
        (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128);
        Tue, 09 Oct 2018 07:30:01 -0700 (PDT)
Received-SPF: pass (google.com: domain of User@office365domain.com designates 104.47.34.69 as permitted sender) client-ip=104.47.34.69;
Authentication-Results: mx.google.com;
       dkim=pass header.i=@office365domaincom.onmicrosoft.com header.s=selector1-office365domain.com header.b=WS4RAZEE;
       spf=pass (google.com: domain of User@office365domain.com designates 104.47.34.69 as permitted sender) smtp.mailfrom=User@office365domain.com
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=office365domaincom.onmicrosoft.com; s=selector1-office365domain.com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=zBWNQdpu/zr9oRtS9Wwd49yUXMaOcbIG/Unsiw8Y7GA=; b=WS4RAZEEg0fV+B/QhQ82+D63P4BjjgyxH93ESWJMQK13s/ymZkD2CiRjZCvNK+OmT6hTLRypkxGTiaZoHDW1o7l3bT9qGZ08kPswuhQ/DSYkFFDtFjx4Ol7mtz8TAh3yH/FHoxR+RGP9cJqB87XnEK26AoicH9uxl0ngLe6ZA8s=
Received: from BL0PR1901MB2034.namprd19.prod.outlook.com (52.132.22.148) by BL0PR1901MB2082.namprd19.prod.outlook.com (52.132.22.160) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1164.25; Tue, 9 Oct 2018 14:29:58 +0000
Received: from BL0PR1901MB2034.namprd19.prod.outlook.com ([fe80::b910:afab:1188:24bc]) by BL0PR1901MB2034.namprd19.prod.outlook.com ([fe80::b910:afab:1188:24bc%5]) with mapi id 15.20.1207.024; Tue, 9 Oct 2018 14:29:58 +0000
From: Jonathan Miller <User@office365domain.com>
To: "User@gmail.com" <User@gmail.com>
Subject: Test 6
Thread-Topic: Test 6
Thread-Index: AdRf3I4F0pTx+xf/uUeMYw8wGK9UhQ==
Date: Tue, 9 Oct 2018 14:29:58 +0000
Message-ID: <BL0PR1901MB2034F3C556814FC2C839F9C5DBE70@BL0PR1901MB2034.namprd19.prod.outlook.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
authentication-results: spf=none (sender IP is ) smtp.mailfrom=User@office365domain.com;
x-ms-exchange-calendar-series-instance-id: BAAAAIIA4AB0xbcQGoLgCAAAAABcsfiN3F/UAQAAAAAAAAAAEAAAAPJgwjfANlhOiCv6DCK5lm8=
x-originating-ip: [76.201.155.18]
x-ms-publictraffictype: Email
x-microsoft-exchange-diagnostics: 1;BL0PR1901MB2082;6:N+RAxyNmsWDN+8pXrb8Ri7CdhQXKvgt9tZHGLCS3McpaTPoimQfp9RO0256iAH99F8THnB+/zzQPOr8mT3G3HLavFhW6uICpePqxZCnWKsoG4ebVjO8+24ZvfFDQbqLvrU/srpaCQgbH0Xr7+NnBcxYdMYvgv0msO8MKm7w5+tgG1u+320LQBH2c16Iig4DInji+ihXvi2l5CPXDQIOC4mQozRklwibrgbNFMLbCs9N8t42jctzzX4bQ0njNfpVeM9jaZUyE1/2AIgE2M2XjZRF0qHvVvZNaOUjgsYw6i7SESb3NDxNoYe+zYlTmMPgrT4ZWk3wM/Gc/OboMdNmuas+alrWs73nIAhWjwmYZf3U=;5:AZRaIZuS7nIroyugANUJHHdxWEWg7IN+fWdNA3JqdZY+0Lf6wMaCmV7A2vyh9EtLpA5Q4tx39J4iwPU6zoP2sp/Px1DNgWndWr6bxRBMOijXdWNmIz65dfvhB0rBmnVAka0TpywJYsZUIctjqyehs9WqYcbYfzyOnlhdLfJAZVA=;7:+bHdOkqzVJwHA5i7aPIR4vYIuJGpDjLTQ2JUDsY35/bp7YtpWBNd4NUTrJyFyCSs1da7zScdJnXo9QMLwljX6VNg/rIlnvKMu/irTbIeEIos8o24bqMN1LkrX7V93Bel88gV1JQRvEViE+5AlKw89JVFzV2ToixI/73Zh81N9VM0fr8AD8MlRfzRI4Ypr2Na2RqdhPNBQ+nXma4vE3PfKB+5LUHUoEXwt3gTkx21XRCvkLOoOoAc/3/aPge8tTfg
x-ms-office365-filtering-correlation-id: d9db13df-1fae-449f-f387-08d62df3b0db
x-microsoft-antispam: BCL:0;PCL:0;RULEID:(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600074)(711020)(2017052603328)(7153060)(7193020);SRVR:BL0PR1901MB2082;
x-ms-traffictypediagnostic: BL0PR1901MB2082:
x-microsoft-antispam-prvs: <BL0PR1901MB20827B6773FC8B7F9A6BD5E9DBE70@BL0PR1901MB2082.namprd19.prod.outlook.com>
x-exchange-antispam-report-test: UriScan:;
x-ms-exchange-senderadcheck: 1
x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(6040522)(2401047)(8121501046)(5005006)(3231355)(944501410)(52105095)(3002001)(10201501046)(93006095)(93001095)(149066)(150057)(6041310)(20161123564045)(20161123558120)(201703131423095)(201702281529075)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(20161123560045)(20161123562045)(201708071742011)(7699051);SRVR:BL0PR1901MB2082;BCL:0;PCL:0;RULEID:;SRVR:BL0PR1901MB2082;
x-forefront-prvs: 08200063E9
x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(396003)(346002)(366004)(376002)(39850400004)(136003)(199004)(189003)(106356001)(102836004)(186003)(26005)(86372001)(71200400001)(55016002)(2906002)(6436002)(74316002)(786003)(1361003)(68736007)(316002)(5640700003)(7116003)(5250100002)(2501003)(256004)(6916009)(25786009)(86362001)(105586002)(8936002)(8676002)(4270600006)(99286004)(53936002)(9686003)(486006)(97736004)(478600001)(6506007)(39060400002)(71190400001)(2900100001)(476003)(7736002)(2351001)(81166006)(44832011)(6116002)(14454004)(3846002)(7696005)(621065002)(33656002)(305945005)(81156014)(1411001)(66066001)(73894003);DIR:OUT;SFP:1101;SCL:1;SRVR:BL0PR1901MB2082;H:BL0PR1901MB2034.namprd19.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1;
received-spf: None (protection.outlook.com: office365domain.com does not designate permitted sender hosts)
x-microsoft-antispam-message-info: l4LOsOtpC4yn82e8RbafkDkiPLqL6QGq/QmHSLVVOg9NV4R53SiNxtzR/mOWjzcoIgJ1dh9dwwqIK306e+/bIoE3Gfa2nLtDErcszrOSa6fvWC6kA1yEitELqXHg3NbaIUPfufWeKKvRI/OkQs8WVWrarGRgM8wLDITJKbX0+tE+nKXjO1IXOxaVqVvFpJkzjZPZPYaLURpjahL2WLa7wSju6okycrQ+5ZemFpriYlM=
spamdiagnosticoutput: 1:99
spamdiagnosticmetadata: NSPM
Content-Type: multipart/alternative; boundary="_002_BL0PR1901MB2034F3C556814FC2C839F9C5DBE70BL0PR1901MB2034_"
MIME-Version: 1.0
X-OriginatorOrg: office365domain.com
X-MS-Exchange-CrossTenant-Network-Message-Id: d9db13df-1fae-449f-f387-08d62df3b0db
X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Oct 2018 14:29:58.5680 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 0afd4c69-0904-42a1-bf52-4c18ba79af07
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR1901MB2082

--_002_BL0PR1901MB2034F3C556814FC2C839F9C5DBE70BL0PR1901MB2034_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable


--_002_BL0PR1901MB2034F3C556814FC2C839F9C5DBE70BL0PR1901MB2034_
Content-Type: text/calendar; charset="utf-8"; method=REQUEST
Content-Transfer-Encoding: base64

QkVHSU46VkNBTEVOREFSDQpNRVRIT0Q6UkVRVUVTVA0KUFJPRElEOk1pY3Jvc29mdCBFeGNoYW5n
ZSBTZXJ2ZXIgMjAxMA0KVkVSU0lPTjoyLjANCkJFR0lOOlZUSU1FWk9ORQ0KVFpJRDpDZW50cmFs
IFN0YW5kYXJkIFRpbWUNCkJFR0lOOlNUQU5EQVJEDQpEVFNUQVJUOjE2MDEwMTAxVDAyMDAwMA0K
VFpPRkZTRVRGUk9NOi0wNTAwDQpUWk9GRlNFVFRPOi0wNjAwDQpSUlVMRTpGUkVRPVlFQVJMWTtJ
TlRFUlZBTD0xO0JZREFZPTFTVTtCWU1PTlRIPTExDQpFTkQ6U1RBTkRBUkQNCkJFR0lOOkRBWUxJ
R0hUDQpEVFNUQVJUOjE2MDEwMTAxVDAyMDAwMA0KVFpPRkZTRVRGUk9NOi0wNjAwDQpUWk9GRlNF
VFRPOi0wNTAwDQpSUlVMRTpGUkVRPVlFQVJMWTtJTlRFUlZBTD0xO0JZREFZPTJTVTtCWU1PTlRI
PTMNCkVORDpEQVlMSUdIVA0KRU5EOlZUSU1FWk9ORQ0KQkVHSU46VkVWRU5UDQpPUkdBTklaRVI7
Q049Sm9uYXRoYW4gTWlsbGVyOk1BSUxUTzpqb25hdGhhbi5taWxsZXJAdXNkMjMyLm9yZw0KQVRU
RU5ERUU7Uk9MRT1SRVEtUEFSVElDSVBBTlQ7UEFSVFNUQVQ9TkVFRFMtQUNUSU9OO1JTVlA9VFJV
RTtDTj1qbWlsbGVyMzc5DQogMkBnbWFpbC5jb206TUFJTFRPOmptaWxsZXIzNzkyQGdtYWlsLmNv
bQ0KVUlEOjA0MDAwMDAwODIwMEUwMDA3NEM1QjcxMDFBODJFMDA4MDAwMDAwMDA1Q0IxRjg4RERD
NUZENDAxMDAwMDAwMDAwMDAwMDAwDQogMDEwMDAwMDAwRjI2MEMyMzdDMDM2NTg0RTg4MkJGQTBD
MjJCOTk2NkYNClNVTU1BUlk7TEFOR1VBR0U9ZW4tVVM6VGVzdCA2DQpEVFNUQVJUO1RaSUQ9Q2Vu
dHJhbCBTdGFuZGFyZCBUaW1lOjIwMTgxMDA5VDEzMDAwMA0KRFRFTkQ7VFpJRD1DZW50cmFsIFN0
YW5kYXJkIFRpbWU6MjAxODEwMDlUMTMzMDAwDQpDTEFTUzpQVUJMSUMNClBSSU9SSVRZOjUNCkRU
U1RBTVA6MjAxODEwMDlUMTQyOTU4Wg0KVFJBTlNQOk9QQVFVRQ0KU1RBVFVTOkNPTkZJUk1FRA0K
U0VRVUVOQ0U6MA0KTE9DQVRJT047TEFOR1VBR0U9ZW4tVVM6DQpYLU1JQ1JPU09GVC1DRE8tQVBQ
VC1TRVFVRU5DRTowDQpYLU1JQ1JPU09GVC1DRE8tT1dORVJBUFBUSUQ6MjExNjcwMTc4OA0KWC1N
SUNST1NPRlQtQ0RPLUJVU1lTVEFUVVM6VEVOVEFUSVZFDQpYLU1JQ1JPU09GVC1DRE8tSU5URU5E
RURTVEFUVVM6QlVTWQ0KWC1NSUNST1NPRlQtQ0RPLUFMTERBWUVWRU5UOkZBTFNFDQpYLU1JQ1JP
U09GVC1DRE8tSU1QT1JUQU5DRToxDQpYLU1JQ1JPU09GVC1DRE8tSU5TVFRZUEU6MA0KWC1NSUNS
T1NPRlQtRE9OT1RGT1JXQVJETUVFVElORzpGQUxTRQ0KWC1NSUNST1NPRlQtRElTQUxMT1ctQ09V
TlRFUjpGQUxTRQ0KWC1NSUNST1NPRlQtTE9DQVRJT05TOltdDQpCRUdJTjpWQUxBUk0NCkRFU0NS
SVBUSU9OOlJFTUlOREVSDQpUUklHR0VSO1JFTEFURUQ9U1RBUlQ6LVBUMTVNDQpBQ1RJT046RElT
UExBWQ0KRU5EOlZBTEFSTQ0KRU5EOlZFVkVOVA0KRU5EOlZDQUxFTkRBUg0K
--_002_BL0PR1901MB2034F3C556814FC2C839F9C5DBE70BL0PR1901MB2034_--

[#5]

Does this happen to all responses from every of your users to every external user that uses gmail for example?
Or does it happen for some of your users not receiving responses?

[#6]

I obviously haven't tested every single user, but as far as we know its organization wide.

[#7]

Just for test, see If the affected user have their Mail accociated any of the other mail services! Log into that account and check the calendar

[#8]

Most if not all of our users do have a gamil account associated with their email, but when I have tested the response does not show up in their Google calendar and since it is affecting multiple other email services where no association would exist, I think it is likely a larger issue.

[#9]

Yes indeed, it seems so! It’s probably a good idea to somehow do a trace from the invite receiving side to see where the responses go!