In the past two weeks, we have been getting NDRs on some email addresses:

Mar 22, 2011 . Several of my clients are reporting that senders are receiving failure notices. We

Jan 18, 2011 . Smtp; 5.1.0 – Unknown address error 550-'5.7.1 Command rejected' (. Filed

get this error when trying to email any yahoo.com …

Jun 24, 2004 . Home Mail Delivery errors 550 5.7.1 Access denied . This will force DeskNow to

5.5.0 smtp;550-5.7.1 Our system has detected an unusual rate of unsolicited.

Dec 13, 2010 . I was trying to configure IIS 6 SMTP server for outbound mail in Windows Server

550 5.7.1 This message does not comply with required standards. Moreover this

Jun 25, 2008 . guys, I'm getting this error when sending to some domains. For the most part, all

Warning: mail() [function.mail]: SMTP server response: 550 5.7.1 Unable to relay.

May 22, 2008 . An open mail relay is a SMTP server configured to allow anyone on the .

Feb 8, 2011 . 550 5.7.1 [BL23] Connections not accepted from IP addresses on . Mail does not

Status: 5.7.1. Diagnostic-Code: smtp;550 5.7.1 Unable to relay for user@domain.

I'm sending an email from a Exchange 2003 The IP isn't listed in a RBL but just to

Jan 4, 2012 . 550 5.7.1 :127.0.0.4:Client host 41.222.208.170 blocked using . (128.163.

550 5.7.1 recipient <%s> expired #244: 550 5.7.1 recipient <%s> invalid #245:

<server.sendingdomain.com #5.7.1 smtp;550 5.7.1 Unable to relay for user@

Jun 29, 2011 . 550 5.7.1 Unable to Relay Mail From Exchange Server . for external addresses

SMTP 550 5.7.1 Unable to relay error. Question: What is a SMTP 550 5.7.1

Apr 30, 2010 . Thread: Sendmail 550 5.7.1 <user@gmail.com>. . But my question is, isn't the

Aug 23, 2011 . nullmailer smtp Failed 550 5.7.1 Unable to relay for user@myhost.myhost big log

Dec 8, 2005 . SendFailedException: 550 5.7.1 <name@company.com>. Relaying denied.

4.3.1 The server specified in the SmtpServer property is not valid or not available

Warning: mail() [function.mail]: SMTP server response: 550 5.7.1 Unable to relay

Feb 4, 2009 . 5.7.1 smtp;550 5.7.1 Unable to relay for, Mike0530, 1/23/09 12:53 PM, After

"SMTP server response: 550 5.7.1 Unable to relay.." This causes drupal to

error 550 5.7.1 Unable to relay for Email. . 10 sm07.internetmailserver.net 64.79.

Page 2-#5.7.1 smtp;550 5.7.1 Unable to deliver to > IIS SMTP and NNTP.

550 5.7.1 MX+ Mismatch - When Email Server Administrators Go Bad. My

SMTP RCPT command failed Error (550) 5.7.1 Unable to relay, Mail . Also,

Please use the SMTP relay at your 550-5.7.1 service provider instead. Learn

Mar 15, 2007 . 5.7.1 smtp;550 5.7.1 Access denied Exchange 2000 / 2003.

<P2036807 #5.7.1 smtp;550 5.7.1 Connections not accepted from servers

Aug 23, 2010 . 550 5.7.1 is a rejection error. The reason given after it "<SMTP gateway IP

Users from another domain cannot send emails with attachments to a user on my

Aug 19, 2011 . 550-”5.7.1 Message rejected as spam by Content Filtering. . a new Intelligent

Oct 10, 2009 . SMTP Error 550 5.7.1 Unable to relay | uptime Software Knowledge Base |

Resolving SMTP error 550 5.7.1 Unable to relay for user@domain.com Error

Jan 30, 2012 . The Exchange SMTP server can be used to receive mail and to relay mail to . is '

For assistance, contact your system administrator. <ibs-mail.domain.local #5.7.1

Oct 19, 2004 . Mail up again - No more "550 5.7.1 Unable to relay for . " . to know it and play

#<#5.7.1 smtp;550 5.7.1 Unable to relay> #SMTP# when sending notifications.

Jan 20, 2011 . Reason: SMTP data accept failure has occurred. Diagnostic code: smtp;550 5.7.1

Mar 21, 2011 . Several of my clients are reporting that senders are receiving failure notices. We

We have an application server which can send emails to clients using K2. This

Aug 29, 2005 . It can be tricky to find the root cause of 5.7.1 NDR errors. Expert David Sengupta

May 10, 2005 . Interpretation of SMTP 5xx errors in VisNetic MailServer Your SMTP log files may

Aug 25, 2011 . A customer wants to send through the Exchange 2010 hub transport server to

From yesterday most of our office have been receiving the same errors when

The error that the other server returned was: 550 550 5.7.1 . . to gmail accounts

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