Error 550 5.7.1 unable to relay with SMTP PORT 25 Exchange 2013

Hi All,
I know this issue has been posted for a while, but still can't resolved issue. We've new Exchange 2013 SP1 (CU4) installation, everything is working properly, the OWA, Exchange Client Connection, SMTP/POP with SSL, except with SMTP Using Port 25 Non-Encrypted
Connection.
If I'm using the SMTP Port 25 without TICK "My Outgoing Server (SMTP) Requires authentication", I've got the error: "550 5.7.1 Unable to relay", but if I TICK the option above, my message will be deliver without any error, how do i get
rid this problem, I need to UN-TICK the option above for the time being, since we've hundreds email account, I want to avoid to educate and tell the user and even remote their PC, just to configure this issue, it will drive me crazy, we're going to use the
Exchange Client Connection in the future, If everything is smooth and ok.
I research this problem on the Internet and of course with TECHNET, but still can't, anyone can help me on this?
fyi, I tried so many things, delete the default the Default Front End Transport for Port 25, it also not fix my issue.
Thx
Irwan

Hi
You can paste the output of below result
Get-receiveconnector | fl name,bindings,PermissionGroups
I think your default receive connector should be missing out some permissions.
Also try to see if you get any message on protocol logs and paste them too
Remember to mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you Check out my latest blog posts on http://exchangequery.com Thanks Sathish
(MVP)

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i got this problem ,when i try to send mail from mail Queue.
ORA-29279: SMTP permanent error: 550 5.7.1 Unable to relay for [email protected]
Edited by: Alekh on Aug 7, 2009 10:13 AM
Edited by: Alekh on Aug 7, 2009 11:52 AM

Hi,
I think you can check your SMTP server with your system administrator firstly. does it work normally?
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Exchange Server 2013 - 550 5.7.1 Unable to Relay

Hi Guys,
I have recently setup Exchange 2013, I have been having an issue were the Emails that we are attempting to send are getting stuck in the 'Drafts' box. I decided to use Telnet to see if I could send emails that way but much to my disappoint I was unable to
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For my external server lookup I have my internal DNS Server for the DNS and my internal DNS Servers forward DNS Requests to Google's Public DNS Servers (8.8.8.8 and 8.8.4.4). I have tried removing Google's DNS Settings and just using my internal servers
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TPark IT Technician

Hi,
Please check whether the Windows services that Exchange requires on a server have started via Test-Servicehealth. Especially Exchange Transport service and Mailbox transport service.
Please add the IP address of our DNS server for testing.
Please also re-configure our Relay Connector, found a useful article for your reference:
How to Configure a Relay Connector in Exchange Server 2013
http://exchangeserverpro.com/exchange-2013-configure-smtp-relay-connector/
If still not working unfortunately, please trace these messages via Message Tracking to check whether there is any error. If has, please post the details for the further troubleshooting.
Disclaimer:
Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure
that you completely understand the risk before retrieving any suggestions from the above link.
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Mavis Huang
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Sendmailjpkg.sendmail - 550 5.7.1 Unable to relay

Hi to all,
Oracle 10g database.
We have an application that sends emails (only with one email address), with sendmailjpkg.sendmail,
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But I do not know how to create authenticator class, how to put authentications in sendmail Java class or in my procedure where I use sendmailjpkg.sendmail, or anywhere else ?
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Isn't that a Java issue rather than a SQL or PL/SQL issue?

Server Response: 550 5.7.1 Unable to relay

SBS 2011 I have exchange 2010,
Internally Outlook send/ Receive working fine-- Local Ip address.
Owa Send/Receive working fine.
But remote user can receive the Emails, But cant send the emails.
Subject 'tes'
Server Error: 550
Server Response: 550 5.7.1 Unable to relay
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Hi,
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http://exchangeserverpro.com/how-to-configure-a-relay-connector-for-exchange-server-2010/
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make
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Belinda
Belinda Ma
TechNet Community Support

Smtp;550 5.7.1 Unable to relay #SMTP#

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smtp;550 5.7.1 Unable to relay> #SMTP#
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.
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Hi Cinekc,
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Exchange server unable to send mail outside
http://social.technet.microsoft.com/Forums/exchange/en-US/ce90b2ea-d2d2-4f15-ab56-43da021c52c9/exchange-server-unable-to-send-mail-outside?forum=exchange2010
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Amy Wang
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#5.7.1 smtp;550 5.7.1 Unable to relay

Hi,
In my company we are facing lot of problems sending emails to some recipients when their email addresses are surrounded by single quotes, in Outlook. Ex.: '[email protected]'. If we remove the quotes the message relays with no problem. The question is why there
are some others domains that if we keep the single quotes the message is relayed. Is the problem in our side (my company) or the other side is rejecting the message in some way. What should I do in this case? I'll appreciate any help. We use Oulook 2007 and
Exchange Server 2003.
Here is the error:
Your message did not reach some or all of the intended recipients.
Subject: Here is the subject
Sent: 23-07-2014 08:52
The following recipient(s) cannot be reached:
[email protected] on 23-07-2014 08:52
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<mail_server #5.7.1 smtp;550 5.7.1 Unable to relay for [email protected]>

Hi,
Thank you sou much for your reply.
My question was. If I keep the single quotes for SOME EXTERNALS RECIPIENTS, I get the error message aboved.
If I remove the single quotes for THOSE EXTERNALS RECIPIENTS the messages can be relayed.
Best regards,
Edmilton Cruz.
Thursday, July 31, 2014 1:40 PM
Hi again,
Any answer to this issue???
Another thing that is happening is that when we send emails to some recipients and their email addresses are in upper case we receive a NDR #5.7.1 smtp;550 5.7.1 Unable to relay for ...
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Javax.mail.SendFailedException: 550 5.7.1 Unable to relay

Hi All,
I am getting the below Exception message when I am executing my JavaMail
program.
nested exception is:
javax.mail.SendFailedException: Invalid Addresses;
nested exception is:
javax.mail.SendFailedException: 550 5.7.1 Unable to relay for [email protected]
Please can anyone help me out.
Regards,
Ravi.

what's wrong to this source code, if try to send mail to local account actually it success, but if i try to send mail eg:[email protected](outside my network) i found error this error to. i had to try not use encode userID/password into base64, but the result doesn't change.
if anyone have solution for this problem, please contact me @ [email protected]
Regards,
agam
error returned by java:
javax.mail.SendFailedException: Invalid Addresses;
nested exception is:
class javax.mail.SendFailedException: 550 Relaying is prohibited
void com.sun.mail.smtp.SMTPTransport.sendMessage(javax.mail.Message, javax.mail.Address[])
import java.util.*;
import java.io.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
import com.sun.mail.smtp.SMTPTransport;
import com.agam198.util.*;
public class PCMMail{
String sMailServer = "";
String sUserID = "";
String sPassword = "";
int iPort = 25;
String sTo = "";
String sFrom = "";
String sCC = "";
Message msg = null;
SMTPTransport transport = null;
Transport trns = null;
public PCMMail(StringPool sPool){
this.sMailServer = sPool.getString("SMTPServer.SERVER");
this.sTo = sPool.getString("SMTPAlert.TO");
this.sFrom = sPool.getString("SMTPAlert.FROM");
this.sCC = sPool.getString("SMTPAlert.CC");
this.sUserID = sPool.getString("SMTPServer.LOGIN");
this.sPassword = sPool.getString("SMTPServer.PASSWORD");
this.iPort = Integer.parseInt(sPool.getString("SMTPServer.PORT"));
initConnection();
public void initConnection(){
try{
System.out.println("MailServer: "+sMailServer);
System.out.println("To: "+sTo);
System.out.println("From: "+sFrom);
System.out.println("CC: "+sCC);
Properties props = new Properties();
props.put("mail.smtp.host", "152.118.89.0");
Session session = Session.getDefaultInstance(props,null);
trns = session.getTransport("smtp");
if(trns == null){
System.out.println("trans is not null");
else
System.out.println("trans null");
trns.connect(sMailServer,Base64.base64Encode ( sUserID ),Base64.base64Encode ( sPassword ));
if(trns.isConnected()){
System.out.println("connected to SMTP SERVER");
else{
System.out.println("not connect");
InternetAddress address = new InternetAddress();
//create a message
msg = new MimeMessage(session);
catch(Exception e){
public void sendMessage(String message){
sendMessage(getFirstLine(message),message);
public void sendMessage(String subject,String message){
try{
//prepare message
msg.setFrom(new InternetAddress(sFrom));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(sTo));
msg.setSubject(subject);
msg.setSentDate(new Date());
msg.setText(message);
trns.send(msg);
System.out.println("message sent");
catch(Exception e){
e.printStackTrace();
public String getFirstLine(String message){
BufferedReader buf = new BufferedReader(new StringReader(message));
try{
return buf.readLine();
catch(Exception e){
return " ";
public static void main(String[] args){
StringPool sp = new StringPool();
sp.set("SMTPServer.SERVER","152.118.89.0");
sp.set("SMTPServer.PORT","25");
sp.set("SMTPServer.LOGIN","kiara");
sp.set("SMTPServer.PASSWORD","kiara");
sp.set("SMTPAlert.TO","[email protected]");
sp.set("SMTPAlert.FROM","[email protected]");
sp.set("SMTPAlert.CC","");
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pcm.sendMessage("subject","message body");
}

Invalid Addresses; nested exception is: class javax.mail.SendFailedException: 550 5.7.1 Unable to relay for

Hi!
I am with a problem during a sending e-mail for 3500
addressees.
In the way it process me of the one error and in log CF
Administrator shows the following error to it:
Invalid Addresses; nested exception is: class
javax.mail.SendFailedException: 550 5.7.1 Unable to relay for
What it could be?
Server Configuration:
Windows 2003 Standard with ColdFusion MX 7.02 (last update)
Best Regards

You need to either authenticate your user or turn on relaying in your SMTP server. See the JavaMail tutorial for how to authenticate

550 5.7.1 Unable to relay

Ok cool, glad you got it figured out. I'd recommend bookmarking his site...when it comes to Exchange, that is definitely a good go to.

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Hello,
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Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

550 5.7.1 Unable to relay for ... (not a question, just a FAQ item)

There's a bug in either Microsoft Exchange or JavaMail API.
An exception is thrown when sending an email:
javax.mail.SendFailedException: Invalid Addresses;
nested exception is:
class com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 Unable to relay for [email protected]
at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1141)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:536)
at javax.mail.Transport.send0(Transport.java:151)
at javax.mail.Transport.send(Transport.java:80)This exception is caused by, believe or not, because the same mail session has defined the "mail.imap.fetchsize" property in an earlier IMAP session.
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Well, I don't believe the fetchsize property is disrupting SMTP sending, but it is true that
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Error 550 5.7.1 unable to relay with SMTP PORT 25 Exchange 2013

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