Error when sending out emails

Question

Hi!

We have a user who sent out a newsletter, and received quite a bit of bouncebacks. Most had this as the error:

Diagnostic information for administrators:

Generating server: SN6PR1501MB2095.namprd15.prod.outlook.com

Receiving server: SN6PR1501MB2095.namprd15.prod.outlook.com 

****@paxxxxxxxce.com<modified by the moderator due to privacy>

1/24/2019 5:30:16 PM - Server at SN6PR1501MB2095.namprd15.prod.outlook.com returned '550 5.4.316 Message expired, connection refused(Socket error code 10061)'

1/24/2019 5:19:08 PM - Server at palmsource.com (10x.2x.9x.6x) returned '450 4.4.316 Connection refused [Message=Socket error code 10061] [LastAttemptedServerName=paxxxxxxxxce.com] [LastAttemptedIP=10x.2x.9x.6x:25] SN1NAM04FT048.eop-NAM04.prod.protection.outlook.com'

Original message headers:

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=merryvale.onmicrosoft.com; s=selector1-merryvale-com;
 h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;
 bh=GosMY1ZV9/g6HPa+yW8Hu3voADfVLmEGxruVvQNgHkA=;
 b=LRFDAPHN5rAFLvG9e/fCucLNDwzAJmjyzoWN/ebcAkGDDXsgtrZTSShHpHmHLquErS1KKfbftx4Pjl2HJCaaMmjheIDljDinkpAqhrPtohsQHz8JEdrzMlL7LN+gQ1UvexJvOVuA4ZH2s+UGA4iN0MAkb2Qh7npYxO4BxvJJZUE=
Received: from SN6PR1501MB2077.namprd15.prod.outlook.com (5x.1xx.1xx.1xx) by
 SN6PR1501MB2095.namprd15.prod.outlook.com (5x.1xx.1xx.1xx) with Microsoft
 SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id
 1x.2x.1xx.3x; Tue, 22 Jan 2019 17:26:56 +0000
Received: from SN6PR1501MB2077.namprd15.prod.outlook.com
 ([fexx::f1xx:cc9e:fxxf:13xxf]) by SN6PR1501MB2077.namprd15.prod.outlook.com
 ([fexxx::f1xx:ccxx:****:130f%3]) with mapi id 1x.2x.1xxx.0x; Tue, 22 Jan 2019
 17:26:56 +0000

Answer 1

Hi OTG Admin,

Thanks for the update in the private message. We are glad to hear that you have found the root cause of the issue.

Moreover, if you have any further question or encounter any other issues regarding Office 365 in future, please feel free to post a new thread in our forum. We are here to further assist you.

Best regards,

Shyamal

Answer 2

Hi OTG Admin,

When you say “We have a user who sent out a newsletter”, may I know whether the user sending bulk commercial email?

Does this issue happen with every recipient or specific recipient?

If it is happen to specific recipient then please contact the recipient side admin (some other means e.g. by phone/personal email) and tell them to add your sending IP addresses/ email address or domain to their allowed/safe senders list to see whether the problem still occurs.

Moreover, please provide us with the derailed non delivery report (NDR) via the Private Message for further analysis.

Best regards,

Shyamal