550 5.1.8 Access denied, spam abuse detected
Since Feb 23 the alerts from ServiceDesk Plus are rejected to external contacts by the Office365 mail servers. Internal contacts have no issue (O365 spam filter not applied for internal mails).
I have spend a couple of hours with a MS tech and we found that the issue is that the messages which SDP sends are not signed. Our configuration of the mailserver has been validated and is correct.
The error is below (see highlighted part). Anybody any idea on how to have SDP send signed messages?
Remote Server returned '550 5.1.8 Access denied, spam abuse detected'
Original message headers:
Received: from sender1.sdpondemand.com (74.201.84.80) by CO2PR06MB889.namprd06.prod.outlook.com (10.141.227.151) with Microsoft SMTP Server (TLS) id 15.1.106.15; Thu, 12 Mar 2015 17:36:38 +0000Date: Thu, 12 Mar 2015 10:36:34 -0700From: Soporte TI <servicedeskplus@XXXXX.onmicrosoft.com>To: <XXXX@YYYY.biz>Message-ID: <716074637.57931426181794764.JavaMail.sas@smtp.office365.com>Subject: [Request ID :##7233##] : Microsoft Outlook Test MessageMIME-Version: 1.0Content-Type: multipart/mixed; boundary="----=_Part_11517_1115630142.1426181794764"Return-Path: servicedeskplus@XXXX.onmicrosoft.comX-Originating-IP: [74.201.84.80]X-ClientProxiedBy: BY2PR08CA0013.namprd08.prod.outlook.com (25.163.62.151) To CO2PR06MB889.namprd06.prod.outlook.com (10.141.227.151)Authentication-Results: YYYY.biz; dkim=none (message not signed) header.d=none;X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:CO2PR06MB889;X-Forefront-Antispam-Report: BMV:1;X-Microsoft-Antispam-PRVS: <XXXXXXXCO2PR06MB889.namprd06.prod.outlook.com>X-Exchange-Antispam-Report-Test: UriScan:;X-Exchange-Antispam-Report-CFA-Test: BCL:0;PCL:0;RULEID:(601004)(5002009)(5005006);SRVR:CO2PR06MB889;X-Forefront-PRVS: 05134F8B4FReporting-MTA: dns;CO2PR06MB889.namprd06.prod.outlook.comReceived-From-MTA: dns;sender1.sdpondemand.comArrival-Date: Thu, 12 Mar 2015 17:36:38 +0000Final-Recipient: rfc822;XXXX@YYYY.bizAction: failedStatus: 5.1.8Diagnostic-Code: smtp;550 5.1.8 Access denied, spam abuse detected