: Email error "Authentication is required for relay" I have recently moved all of my websites to a new (and more secure server). Out of 50 customers, 2-3 are having email issues, specifically

I have recently moved all of my websites to a new (and more secure server). Out of 50 customers, 2-3 are having email issues, specifically with sending emails within the same domain and to domains on the same server.

Here's a sample error message:

Diagnostic information for administrators:

Generating server: AMXPR04MB247.eurprd04.prod.outlook.com

pat@moonspace.co.uk babcom-h2.lnc.net Remote Server returned '550
Authentication is required for relay'

Original message headers:

Received: from DB3PRD0411HT001.eurprd04.prod.outlook.com
(10.255.73.36) by AMXPR04MB247.eurprd04.prod.outlook.com
(10.242.72.18) with Microsoft SMTP Server (TLS) id 15.0.800.7; Fri,
15 Nov 2013 08:54:25 +0000 Received: from [192.168.1.10]
(109.145.84.154) by pod51014.outlook.com (10.255.73.36) with
Microsoft SMTP Server (TLS) id 14.16.371.2; Fri, 15 Nov 2013 08:54:24
+0000 From: Franklyn Nevard Content-Type: multipart/alternative;
boundary="Apple-Mail=_2340A5CF-1977-490C-A345-7D19967ACFFE"
Message-ID:

MIME-Version: 1.0 (Mac OS X Mail 7.0 (1822)) Subject: Re: Hosting
invoice from MoonSpace Date: Fri, 15 Nov 2013 08:54:21 +0000
References: <52851A01.7090302@moonspace.co.uk> To: Pat Dobson
In-Reply-To: <52851A01.7090302@moonspace.co.uk>
X-Mailer: Apple Mail (2.1822) Return-Path:
franklyn@franklynnevard.co.uk X-Originating-IP: [109.145.84.154]
X-Forefront-PRVS: 0031A0FFAF X-Forefront-Antispam-Report:
SFV:NSPM;SFS:(71364002)(51704005)(199002)(189002)(24454002)(81342001)(74366001)(56816003)(16601075003)(76786001)(16236675002)(65816001)(63696002)(15202345003)(53806001)(82746002)(69556001)(15974865002)(81542001)(4396001)(80022001)(76796001)(51856001)(77156001)(15975445006)(87266001)(87286001)(66066001)(46102001)(85306002)(36756003)(74706001)(83716003)(83322001)(83072001)(71186001)(57306001)(33656001)(512874002)(74876001)(512934002)(31966008)(80976001)(76482001)(56776001)(81686001)(62966002)(47446002)(77982001)(54316002)(84326002)(19580405001)(79102001)(19580395003)(69226001)(74662001)(50986001)(567704001)(74482001)(47736001)(59766001)(81816001)(50226001)(49866001)(47976001)(87936001)(74502001);DIR:OUT;SFP:;SCL:1;SRVR:AMXPR04MB247;H:DB3PRD0411HT001.eurprd04.prod.outlook.com;CLIP:109.145.84.154;FPR:;RD:InfoNoRecords;A:1;MX:1;LANG:en;
X-OriginatorOrg: franklynnevard.co.uk

Reporting-MTA: dns;AMXPR04MB247.eurprd04.prod.outlook.com
Received-From-MTA: dns;DB3PRD0411HT001.eurprd04.prod.outlook.com
Arrival-Date: Fri, 15 Nov 2013 08:54:25 +0000

Final-Recipient: rfc822;pat@moonspace.co.uk Action: failed Status:
5.0.0 Diagnostic-Code: smtp;550 Authentication is required for relay Remote-MTA: dns;babcom-h2.lnc.net X-Display-Name: Pat Dobson

The question is, is this something that I can do something about (i.e. is it a configuration error on my users email settings) or do I need to go to the server hosts about it ?
I have already contacted the server hosts and they say that it's nothing to do with them. What makes me suspicious is that most users have no problems.

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@Speyer207

If you look at your log report you can see that it is returning a 550 error related to Authentication issues. This is most likely due to the fact you have not checked My outgoing server (SMTP) requires authentication.

More information here:

When attempting to send email using Microsoft Outlook, Outlook
Express, or other email client software, you may receive the message
"550 Authentication is required for relay" from your mail server.

The reason for this error is that your email server is configured to
require SMTP authentication to send outgoing mail, which is a way an
email sender can be authorized. In order to resolve this issue you
will need to configure your email client (Outlook, Outlook Express,
Eudora, Thunderbird, etc) to send the appropriate credentials.

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: Email error "Authentication is required for relay" I have recently moved all of my websites to a new (and more secure server). Out of 50 customers, 2-3 are having email issues, specifically

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