Scott Milner
asked on
Mail from my domain is being rejected by some recipient domains.
We have a Microsoft O365 hosted mail domain (jdmfg.com), that has been relatively stable since we transitioned to it a year ago. Last week, I began to receive reports that some of our customer's were not receiving emails that my team were sending to them. At first there were no NDR's generated, so I assumed that the problem was on the recipient's end (junk mail folder, spam filtering false positives).
Later that week we began to see mail to a few domains be rejected, and I was able to review the NDR. In each case, the message we were receiving is something like this one from charter.net:
Emails rejected by Nordstromlbr.com
__________________________ __________ _________
From: Microsoft Outlook
Sent: Wednesday, October 21, 2015 9:20 AM
To: XXX XXXXX
Subject: Undeliverable: Confirmation
imp13 rejected your message to the following email addresses:
eric@nordstromlbr.com (eric@nordstromlbr.com)
There's a problem with the recipient's mailbox. Please try resending the message. If the problem continues, please contact your email admin.
imp13 gave this error:
XqLQ1r00P29xdZ301qLRnF Message identified as SPAM - Please visit http://www.charter.com/postmaster (http://www.charter.com/postmaster) E5110
Diagnostic information for administrators:
Generating server: BY2PR02MB124.namprd02.prod .outlook.c om
eric@nordstromlbr.com
imp13
Remote Server returned '550 5.2.0 XqLQ1r00P29xdZ301qLRnF Message identified as SPAM - Please visit http://www.charter.com/postmaster (http://www.charter.com/postmaster) E5110'
Original message headers:
Received: from BY2PR02MB1749.namprd02.pro d.outlook. com (10.163.27.147) by
BY2PR02MB124.namprd02.prod .outlook.c om (10.242.43.149) with Microsoft SMTP
Server (TLS) id 15.1.300.14; Wed, 21 Oct 2015 14:20:23 +0000
Received: from BY2PR02MB1750.namprd02.pro d.outlook. com (10.163.27.148) by
BY2PR02MB1749.namprd02.pro d.outlook. com (10.163.27.147) with Microsoft SMTP
Server (TLS) id 15.1.300.14; Wed, 21 Oct 2015 14:20:21 +0000
Received: from BY2PR02MB1750.namprd02.pro d.outlook. com ([10.163.27.148]) by
BY2PR02MB1750.namprd02.pro d.outlook. com ([10.163.27.148]) with mapi id
15.01.0300.010; Wed, 21 Oct 2015 14:20:21 +0000
From: Lynn Stieber <LynnS@jdmfg.com>
To: "eric@nordstromlbr.com" <eric@nordstromlbr.com>
Subject: Confirmation
Thread-Topic: Confirmation
Thread-Index: AdEMC5ZZ3jKeXtLnSPqkcsFB0J Jdpw==
Date: Wed, 21 Oct 2015 14:20:20 +0000
Message-ID: <BY2PR02MB1750EA6D2CB9098B E5AC4D25B1 380@BY2PR0 2MB1750.na mprd02.pro d.outlook. com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
authentication-results: spf=none (sender IP is )
smtp.mailfrom=LynnS@jdmfg. com;
x-originating-ip: [71.13.170.34]
x-microsoft-exchange-diagn ostics: 1;BY2PR02MB1749;5:zvxgF1K8 ljlh/kMYye IdA0RQTh41 /6Z42iW8QK hPs3rhKhvF zLj4F5vD8l AkQHJjOeOS T2MF7noiU+ xvMNTPxcv7 d3v2pBiMMa qOObSIiuYL xDx4PKqLM5 Lz0wQ3D0JF N56aK0obH5 gJav/i1aHz uA==;24:Sm 1XcBDMBVGM tEjO0OlAcg s3qTySor9m 7G3NTUJ5U1 K+tzq89Di0 qPkZdVa2w/ eBau7+Zamw wWiqrPlM3y tLKLLa/Ulw GAN/wsYusI OvT2w=;20: MWkuDn+QUk TYkUkD6WXM bTmBSl6Oas Borm2u6XrS 6ZqZAoSnr5 4naxyP0rSj xQORFeiuWL y6XVHSXfPI oGZCRA==
x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEI D:;SRVR:BY 2PR02MB174 9;
x-microsoft-antispam-prvs: <BY2PR02MB1749D220219F9A42 F2133DBDB1 380@BY2PR0 2MB1749.na mprd02.pro d.outlook. com>
x-exchange-antispam-report -test: UriScan:;
x-exchange-antispam-report -cfa-test: BCL:0;PCL:0;RULEID:(601004 )(2401047) (812150104 6)(520078) (5005006)( 3002001)(1 02115026); SRVR:BY2PR 02MB1749;B CL:0;PCL:0 ;RULEID:;S RVR:BY2PR0 2MB1749;
x-forefront-prvs: 073631BD3D
x-forefront-antispam-repor t: SFV:NSPM;SFS:(10009020)(60 09001)(189 002)(19900 3)(1623667 5004)(9256 6002)(5004 730100002) (500797010 0001)(9928 6002)(7389 4003)(1040 0500002)(1 05586002)( 1110050000 1)(7657600 1)(2217330 01)(101416 001)(29001 00001)(770 96005)(500 3600100002 )(97736004 )(10283600 2)(5008740 100001)(81 156007)(87 936001)(46 102003)(18 9998001)(3 3656002)(1 06356001)( 450100001) (122556002 )(40100003 )(2351001) (229853001 )(74316001 )(64706001 )(86362001 )(50026401 00001)(543 56999)(660 66001)(107 886002)(11 0136002)(2 501003)(50 0196010000 2)(5098699 9)(8079200 5)(9993600 1)(1494379 5004);DIR: OUT;SFP:11 01;SCL:1;S RVR:BY2PR0 2MB1749;H: BY2PR02MB1 750.namprd 02.prod.ou tlook.com; FPR:;SPF:N one;PTR:In foNoRecord s;MX:1;A:1 ;LANG:en;
received-spf: None (protection.outlook.com: jdmfg.com does not designate
permitted sender hosts)
spamdiagnosticoutput: 1:23
spamdiagnosticmetadata: NSPM
Content-Type: multipart/mixed;
boundary="_004_BY2PR02MB17 50EA6D2CB9 098BE5AC4D 25B1380BY2 PR02MB1750 namp_"
MIME-Version: 1.0
X-MS-Exchange-CrossTenant- originalar rivaltime: 21 Oct 2015 14:20:20.8967
(UTC)
X-MS-Exchange-CrossTenant- fromentity header: Hosted
X-MS-Exchange-CrossTenant- id: 77ac37e5-25ee-4b69-bf60-39 ad5a14a9cd
X-MS-Exchange-Transport-Cr ossTenantH eadersStam ped: BY2PR02MB1749
Return-Path: LynnS@jdmfg.com
X-Microsoft-Exchange-Diagn ostics:
1;BY2PR02MB124;2:xgx497ci0 k9/SSwOGx0 DqsV6dacxY 75BTAsyU1o yUa2+JR6Dp 3Qn9/6G9F4 uDViJRfUo7 NVfufyoQtX T/MH1hQMk1 A9x7T2dSUi 2Czlr5xqjy tuQF4iSlSK pFzi/YJlR1 qQQ1mxcd1v AcSXW3vc/V 78Fz0M3w4C /ZijPPiV8t 74=;23:GIz AOBFGmw28y QGwCS8xFCF oMXugXOO/G P1Ac00frRb mN8Ad7qAeZ 84vZwg8czp tvIT7cXHhK BhGl8wu/s5 UMBllalgUk o16OS+7niD wYu/lEcnnV sDGwPfc6YO sDh2Ot9Auc cF/EJjNr4P wjGJx1nPeX f7A2eluGbd 7kJAnGtXXL jgM/Wnc1De Fr49l1PVh
X-OriginatorOrg: jdmfg.com
And here's a slightly different NDR, this one generated by synacor.com:
Your message to fullersorders@tds.net couldn't be delivered.
Security or policy settings at tds.net have rejected your message
scottm Office 365 tds.net
Sender Action Required
Sender not permitted
How to Fix It
Contact the recipient (by phone or instant messaging, for example) and tell them to ask their email admin to add you to their allow list.
If the problem continues, forward this message to your email admin.
Was this helpful? Send feedback.
__________________________ __________ ____
More Info for Email Admins
This error occurs when the email system of the recipient's domain has security or policy settings that reject the sender's message. However, we were unable to determine the specific setting that's causing this.
To fix the issue, contact the email admin at the recipient domain and ask them to add the sender's email address to their allow list, or to relax the setting that's causing the rejection.
If you get this error when sending to recipients who are not hosted by Office 365 it's possible one or more of the sending IP addresses used by Office 365 has been placed on a block list or that the message appears to the recipient domain as malicious or as spam. Examine the "Reported error" in the Error Details section below to help determine the cause. If you determine that it's because Office 365 was placed on a block list, you can open a Service Request with Microsoft Support for assistance (choose Mail Protection -> Message was blocked as spam).
For more information, see Error code 5.7.1 in Exchange Online and Office 365.
Original Message Details
Created Date: 10/23/2015 4:56:52 PM
Sender Address: scottm@jdmfg.com
Recipient Address: fullersorders@tds.net
Subject: test
Error Details
Reported error: 554 5.7.1 [P4] Message blocked due to spam content in the message.
DSN generated by: BY2PR02MB1718.namprd02.pro d.outlook. com
Remote server: mx02.tds.cmh.synacor.com
Message Hops
HOP TIME (UTC) FROM TO WITH RELAY TIME
1 10/23/2015
4:56:52 PM BY2PR02MB1719.namprd02.pro d.outlook. com BY2PR02MB1719.namprd02.pro d.outlook. com mapi *
2 10/23/2015
4:56:52 PM BY2PR02MB1719.namprd02.pro d.outlook. com BY2PR02MB1718.namprd02.pro d.outlook. com Microsoft SMTP Server (TLS) *
Original Message Headers
Received: from BY2PR02MB1719.namprd02.pro d.outlook. com (10.163.27.141) by
BY2PR02MB1718.namprd02.pro d.outlook. com (10.163.27.140) with Microsoft SMTP
Server (TLS) id 15.1.306.13; Fri, 23 Oct 2015 16:56:52 +0000
Received: from BY2PR02MB1719.namprd02.pro d.outlook. com ([10.163.27.141]) by
BY2PR02MB1719.namprd02.pro d.outlook. com ([10.163.27.141]) with mapi id
15.01.0306.003; Fri, 23 Oct 2015 16:56:52 +0000
From: Scott Milner <scottm@jdmfg.com>
To: "fullersorders@tds.net" <fullersorders@tds.net>
Subject: test
Thread-Topic: test
Thread-Index: AdENs821rwJkEe5nSa+1qjFZPk crNA==
Date: Fri, 23 Oct 2015 16:56:52 +0000
Message-ID: <BY2PR02MB17191C0B2938BD50 DA9C82FBC5 260@BY2PR0 2MB1719.na mprd02.pro d.outlook. com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
authentication-results: spf=none (sender IP is )
smtp.mailfrom=scottm@jdmfg .com;
x-originating-ip: [71.13.170.34]
x-microsoft-exchange-diagn ostics: 1;BY2PR02MB1718;5:sYVesZQz YbFbjxrW3l IaAXGHGvIP IAI65E09Ax mXmksmFc/8 e6T5JTwwsl Lw26bzFxc0 NZv/EjdEMV 2KjRpGWzlc /3zznclibk jnpiGbZftv a0ez/dpHQU PHOYqP+bf4 upOf39m0KQ HH1LKvaDLd dA==;24:PB /OO5Mh4/xY wUwo27rS+2 XDa4ST+Es5 LX+aJGMD4W nYALmSM+X6 iMXrm+EN1F MOsyVkl6Tp Cb70hYx/rX ErKwSFH7MA 6uoYOpHGfX CJA/k=;20: GRQBSUEKjp 3OibeUyglm YoFFcV/Om0 D28eeAwyQm 87XI1UDOmQ zGJsYVuxLf JUcz8ZSOMi xVFQcXPDBG TM9tRw==
x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEI D:;SRVR:BY 2PR02MB171 8;
x-microsoft-antispam-prvs: <BY2PR02MB1718811730BFCC0A BB74268FC5 260@BY2PR0 2MB1718.na mprd02.pro d.outlook. com>
x-exchange-antispam-report -test: UriScan:(108003899814671);
x-exchange-antispam-report -cfa-test: BCL:0;PCL:0;RULEID:(601004 )(2401047) (5005006)( 520078)(81 21501046)( 3002001)(1 02215026); SRVR:BY2PR 02MB1718;B CL:0;PCL:0 ;RULEID:;S RVR:BY2PR0 2MB1718;
x-forefront-prvs: 0738AF4208
x-forefront-antispam-repor t: SFV:NSPM;SFS:(10009020)(60 09001)(189 002)(19900 3)(2217330 01)(111005 00001)(177 60045003)( 5002640100 001)(45010 0001)(1014 16001)(102 836002)(15 975445007) (290010000 1)(9256600 2)(5004730 100002)(81 156007)(97 736004)(77 096005)(50 0874010000 1)(6606600 1)(1930040 5004)(7431 6001)(7657 6001)(5007 970100001) (104005000 02)(250100 3)(4010000 3)(1078860 02)(182060 15028)(110 136002)(50 0196010000 2)(1225560 02)(162366 75004)(500 1920100001 )(54356999 )(50036001 00002)(195 80405001)( 1962521500 2)(2351001 )(10558600 2)(5580840 03)(229853 001)(19580 395003)(10 6356001)(5 0986999)(8 6362001)(1 9627595001 )(33656002 )(99286002 )(18999800 1)(8793600 1)(9993600 1)(7059030 )(21728300 1)(2202430 01);DIR:OU T;SFP:1101 ;SCL:1;SRV R:BY2PR02M B1718;H:BY 2PR02MB171 9.namprd02 .prod.outl ook.com;FP R:;SPF:Non e;PTR:Info NoRecords; MX:1;A:1;L ANG:en;
received-spf: None (protection.outlook.com: jdmfg.com does not designate
permitted sender hosts)
spamdiagnosticoutput: 1:23
spamdiagnosticmetadata: NSPM
Content-Type: multipart/related;
boundary="_004_BY2PR02MB17 191C0B2938 BD50DA9C82 FBC5260BY2 PR02MB1719 namp_";
type="multipart/alternativ e"
MIME-Version: 1.0
X-OriginatorOrg: jdmfg.com
X-MS-Exchange-CrossTenant- originalar rivaltime: 23 Oct 2015 16:56:52.0940
(UTC)
X-MS-Exchange-CrossTenant- fromentity header: Hosted
X-MS-Exchange-CrossTenant- id: 77ac37e5-25ee-4b69-bf60-39 ad5a14a9cd
X-MS-Exchange-Transport-Cr ossTenantH eadersStam ped: BY2PR02MB1718
-------------------------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------
My first troubleshooting step was to check jdmfg.com in the blacklists. Our actual mail host is jdmfg-com.mail.protection. outlook.co m. MXToolbox finds no issues at all with this domain or it's associated IP address (the entire list of blacklists sites comes back green).
My next step was to review our antivirus logs (we use TrendMicro) for potential infections, thinking that one of my users may have spammed a user, causing the block without a blacklist entry. I can find no trace of malware infections on any of our domain computers.
My next step was to open a case with Microsoft Office 365 support. The looked over things on their end and didn't see any problems. We sent a couple of test emails in non-html format (with the signature deleted), and received the same NDR as before. The engineer reviewed the NDR and email header information with me, and showed that while the end user's systems were calling the blank message spam, Forefront doesn't see any issues with the email as it is being sent. Therefore, he stated, this is a problem with the mail recipient's system, and there is nothing further he, nor I, can do. He instructed me to contact the mail recipients and ask that our domain be whitelisted.
We've called the affected customers and made the request for whitelisting, but we have had no resolution to the problems yet. As you can imagine, me telling my end users 'There's nothing more that I can do!' is going over like a lead balloon.
Is there some troubleshooting that I've missed? The fact that these email/spam services (synacor, charter) are stating that email from my domain is spam really makes me wonder if there isn't some problem that I'm missing.
The only thing that has changed in any way with our email system in the past few weeks is that I set up a mail relay using O365, allowing machines on our network that cannot do TLS to send email to our email domain only. I don't see that this has any bearing on our problem, but I'm hesitant to rule anything out at this point.
Does anyone have any ideas for me to try next?
Scott
Later that week we began to see mail to a few domains be rejected, and I was able to review the NDR. In each case, the message we were receiving is something like this one from charter.net:
Emails rejected by Nordstromlbr.com
__________________________
From: Microsoft Outlook
Sent: Wednesday, October 21, 2015 9:20 AM
To: XXX XXXXX
Subject: Undeliverable: Confirmation
imp13 rejected your message to the following email addresses:
eric@nordstromlbr.com (eric@nordstromlbr.com)
There's a problem with the recipient's mailbox. Please try resending the message. If the problem continues, please contact your email admin.
imp13 gave this error:
XqLQ1r00P29xdZ301qLRnF Message identified as SPAM - Please visit http://www.charter.com/postmaster (http://www.charter.com/postmaster) E5110
Diagnostic information for administrators:
Generating server: BY2PR02MB124.namprd02.prod
eric@nordstromlbr.com
imp13
Remote Server returned '550 5.2.0 XqLQ1r00P29xdZ301qLRnF Message identified as SPAM - Please visit http://www.charter.com/postmaster (http://www.charter.com/postmaster) E5110'
Original message headers:
Received: from BY2PR02MB1749.namprd02.pro
BY2PR02MB124.namprd02.prod
Server (TLS) id 15.1.300.14; Wed, 21 Oct 2015 14:20:23 +0000
Received: from BY2PR02MB1750.namprd02.pro
BY2PR02MB1749.namprd02.pro
Server (TLS) id 15.1.300.14; Wed, 21 Oct 2015 14:20:21 +0000
Received: from BY2PR02MB1750.namprd02.pro
BY2PR02MB1750.namprd02.pro
15.01.0300.010; Wed, 21 Oct 2015 14:20:21 +0000
From: Lynn Stieber <LynnS@jdmfg.com>
To: "eric@nordstromlbr.com" <eric@nordstromlbr.com>
Subject: Confirmation
Thread-Topic: Confirmation
Thread-Index: AdEMC5ZZ3jKeXtLnSPqkcsFB0J
Date: Wed, 21 Oct 2015 14:20:20 +0000
Message-ID: <BY2PR02MB1750EA6D2CB9098B
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
authentication-results: spf=none (sender IP is )
smtp.mailfrom=LynnS@jdmfg.
x-originating-ip: [71.13.170.34]
x-microsoft-exchange-diagn
x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEI
x-microsoft-antispam-prvs:
x-exchange-antispam-report
x-exchange-antispam-report
x-forefront-prvs: 073631BD3D
x-forefront-antispam-repor
received-spf: None (protection.outlook.com: jdmfg.com does not designate
permitted sender hosts)
spamdiagnosticoutput: 1:23
spamdiagnosticmetadata: NSPM
Content-Type: multipart/mixed;
boundary="_004_BY2PR02MB17
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-
(UTC)
X-MS-Exchange-CrossTenant-
X-MS-Exchange-CrossTenant-
X-MS-Exchange-Transport-Cr
Return-Path: LynnS@jdmfg.com
X-Microsoft-Exchange-Diagn
1;BY2PR02MB124;2:xgx497ci0
X-OriginatorOrg: jdmfg.com
And here's a slightly different NDR, this one generated by synacor.com:
Your message to fullersorders@tds.net couldn't be delivered.
Security or policy settings at tds.net have rejected your message
scottm Office 365 tds.net
Sender Action Required
Sender not permitted
How to Fix It
Contact the recipient (by phone or instant messaging, for example) and tell them to ask their email admin to add you to their allow list.
If the problem continues, forward this message to your email admin.
Was this helpful? Send feedback.
__________________________
More Info for Email Admins
This error occurs when the email system of the recipient's domain has security or policy settings that reject the sender's message. However, we were unable to determine the specific setting that's causing this.
To fix the issue, contact the email admin at the recipient domain and ask them to add the sender's email address to their allow list, or to relax the setting that's causing the rejection.
If you get this error when sending to recipients who are not hosted by Office 365 it's possible one or more of the sending IP addresses used by Office 365 has been placed on a block list or that the message appears to the recipient domain as malicious or as spam. Examine the "Reported error" in the Error Details section below to help determine the cause. If you determine that it's because Office 365 was placed on a block list, you can open a Service Request with Microsoft Support for assistance (choose Mail Protection -> Message was blocked as spam).
For more information, see Error code 5.7.1 in Exchange Online and Office 365.
Original Message Details
Created Date: 10/23/2015 4:56:52 PM
Sender Address: scottm@jdmfg.com
Recipient Address: fullersorders@tds.net
Subject: test
Error Details
Reported error: 554 5.7.1 [P4] Message blocked due to spam content in the message.
DSN generated by: BY2PR02MB1718.namprd02.pro
Remote server: mx02.tds.cmh.synacor.com
Message Hops
HOP TIME (UTC) FROM TO WITH RELAY TIME
1 10/23/2015
4:56:52 PM BY2PR02MB1719.namprd02.pro
2 10/23/2015
4:56:52 PM BY2PR02MB1719.namprd02.pro
Original Message Headers
Received: from BY2PR02MB1719.namprd02.pro
BY2PR02MB1718.namprd02.pro
Server (TLS) id 15.1.306.13; Fri, 23 Oct 2015 16:56:52 +0000
Received: from BY2PR02MB1719.namprd02.pro
BY2PR02MB1719.namprd02.pro
15.01.0306.003; Fri, 23 Oct 2015 16:56:52 +0000
From: Scott Milner <scottm@jdmfg.com>
To: "fullersorders@tds.net" <fullersorders@tds.net>
Subject: test
Thread-Topic: test
Thread-Index: AdENs821rwJkEe5nSa+1qjFZPk
Date: Fri, 23 Oct 2015 16:56:52 +0000
Message-ID: <BY2PR02MB17191C0B2938BD50
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
authentication-results: spf=none (sender IP is )
smtp.mailfrom=scottm@jdmfg
x-originating-ip: [71.13.170.34]
x-microsoft-exchange-diagn
x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEI
x-microsoft-antispam-prvs:
x-exchange-antispam-report
x-exchange-antispam-report
x-forefront-prvs: 0738AF4208
x-forefront-antispam-repor
received-spf: None (protection.outlook.com: jdmfg.com does not designate
permitted sender hosts)
spamdiagnosticoutput: 1:23
spamdiagnosticmetadata: NSPM
Content-Type: multipart/related;
boundary="_004_BY2PR02MB17
type="multipart/alternativ
MIME-Version: 1.0
X-OriginatorOrg: jdmfg.com
X-MS-Exchange-CrossTenant-
(UTC)
X-MS-Exchange-CrossTenant-
X-MS-Exchange-CrossTenant-
X-MS-Exchange-Transport-Cr
--------------------------
My first troubleshooting step was to check jdmfg.com in the blacklists. Our actual mail host is jdmfg-com.mail.protection.
My next step was to review our antivirus logs (we use TrendMicro) for potential infections, thinking that one of my users may have spammed a user, causing the block without a blacklist entry. I can find no trace of malware infections on any of our domain computers.
My next step was to open a case with Microsoft Office 365 support. The looked over things on their end and didn't see any problems. We sent a couple of test emails in non-html format (with the signature deleted), and received the same NDR as before. The engineer reviewed the NDR and email header information with me, and showed that while the end user's systems were calling the blank message spam, Forefront doesn't see any issues with the email as it is being sent. Therefore, he stated, this is a problem with the mail recipient's system, and there is nothing further he, nor I, can do. He instructed me to contact the mail recipients and ask that our domain be whitelisted.
We've called the affected customers and made the request for whitelisting, but we have had no resolution to the problems yet. As you can imagine, me telling my end users 'There's nothing more that I can do!' is going over like a lead balloon.
Is there some troubleshooting that I've missed? The fact that these email/spam services (synacor, charter) are stating that email from my domain is spam really makes me wonder if there isn't some problem that I'm missing.
The only thing that has changed in any way with our email system in the past few weeks is that I set up a mail relay using O365, allowing machines on our network that cannot do TLS to send email to our email domain only. I don't see that this has any bearing on our problem, but I'm hesitant to rule anything out at this point.
Does anyone have any ideas for me to try next?
Scott
ASKER CERTIFIED SOLUTION
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I think you misunderstood, you need to send a normal email, that's not a test.
One that at least looks normal.
Because it's very well possible that these 'test' messages are being blocked for spam content, but that genuine messages are being blocked for a different reason.
So we need to see the original message and NDR for a typical message that doesn't look spammy.
However in any case for maximum deliverability you'll need to be ever-vigilant getting on whitelists, or use a 3rd party.
One that at least looks normal.
Because it's very well possible that these 'test' messages are being blocked for spam content, but that genuine messages are being blocked for a different reason.
So we need to see the original message and NDR for a typical message that doesn't look spammy.
However in any case for maximum deliverability you'll need to be ever-vigilant getting on whitelists, or use a 3rd party.
SOLUTION
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ASKER
I see what you mean. I've attached two emails, one the test that I just sent, and the other the NDR that I received in response to that test.
I will look into the email delivery service that you mentioned. At this point, the owner of the company may deem it a good investment.
Scott
test.msg
Undeliverable-test.msg