Questions tagged [ndr]

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Exchange 2003 mail non-delivery (NDR), spam activity? events 7002 & 7004

Windows Server 2003 Small Business Server SP2 Exchange Version 6.5 (Build 7638.2: Service Pack 2) This network has been neglected and has been having email problems for years and was on many ...
HighTechGeek's user avatar
3 votes
1 answer
2k views

Moving X400 address to user's new mailbox, internal NDR

We have a user who has had access to his old mailbox restricted by management. However, they want them to continue to receive mail in a new mailbox using the same SMTP address. The situation is, the ...
James Edmonds's user avatar
2 votes
3 answers
1k views

Exchange 2007 NDRs

We have NDRs disabled on our Exchange 2007 server to prevent backscatter. Is there any way to enable NDRs only when messages exceed size limits? It can be frustrating for people when their messages ...
Brett G's user avatar
  • 2,023
2 votes
1 answer
874 views

Exchange 2003, disable NDR

How do I completely disable NDR messages in Exchange 2003? I don't want Exchange to send any non delivery reports anymore. I did already: From Exchange System Manager, Global Settings, Internet ...
jao's user avatar
  • 391
2 votes
1 answer
465 views

Tracking 5.1.1 User Unknown in Exchange

We recently discovered that one of our mailboxes was missing an important email alias, because the person that did our marketing forgot to ask for it to be created. Is there any way in Exchange that ...
Mark Henderson's user avatar
1 vote
6 answers
1k views

How to handle invalid email addresses?

My server is windows server 2003. I got a huge list of subscribers. Lots of them have invalid email like, [email protected], [email protected], [email protected]... I want to send a email to all my ...
user avatar
1 vote
4 answers
5k views

Sending bounce mail messages customized for employees no longer with the company

Currently we use a hosting company for our Exchange services. We are considering a switch to Google apps, but that is in a pilot program at the present time. Our Exchange provider and Google Apps ...
Richard West's user avatar
  • 2,978
1 vote
1 answer
3k views

email server have no reverse DNS entry

I'm having problem with one of my target email recipient, when I tried to send email to [email protected], I got this error message from my email server: Diagnostic information for ...
Senior Systems Engineer's user avatar
1 vote
1 answer
381 views

Postfix - NDR messages immediately when sent to a bad domain

We have a service that we offer to one of our clients that sends statements to their clients. Unfortunately, our customer's validation of email addresses isn't always the best, so when they submit a ...
StarKev2525's user avatar
1 vote
3 answers
11k views

Hotmail Senders receiving NDR : "550-Please turn on SMTP Authentication in your mail client..."

Recently, senders from Hotmail have begun to get the following NDR when trying to e-mail our domain. EDIT : Full NDR Message Action: failed Status: 5.5.0 Diagnostic-Code: smtp;550-Please turn on ...
DKNUCKLES's user avatar
  • 4,028
1 vote
2 answers
12k views

#550 5.6.0 M2MCVT.StorageError; storage error in content conversion ##

We are getting this error on one user's computer, running Windows 7 and Outlook 2007 in a domain environment. Exchange Server is 2007. It only happens occasionally for random email addresses, ...
Kez's user avatar
  • 448
1 vote
1 answer
1k views

What is the correct way to get an NDR to be sent when a bounce back occurs?

I have a user who developed a WebApp that sends SMTP messages. Users are able to reply to the message using a MUA (outlook, whatever) but there is no NDR if the user doesn't exist. I suspect that ...
makerofthings7's user avatar
1 vote
1 answer
7k views

What is the role of the "generating server" and/or "Reporting-MTA" in an Exchange NDR?

I'm a little confused on what exactly the "generating server" does in an NDR. For example, I got the following NDR back when sending to a specific domain: Diagnostic information for administrators: ...
Mike B's user avatar
  • 12k
1 vote
2 answers
769 views

Sporadic email delivery to one user

I have a user that occasionally does not receive emails from outside our organization. It does not seem to matter whether the other person is replying to an initial email or sending a new message. I ...
minamhere's user avatar
  • 859
1 vote
1 answer
950 views

Postfix LDAP aliases - user unknown

I have server POSTFIX + DOVECOT with LDAP (ActiveDirectory) authorization. /etc/postfix/ldap_virtual_mailbox_maps.cf query_filter = (&(objectClass=person)(mail=%s)) result_filter = %s ...
Vitaly579's user avatar
1 vote
1 answer
2k views

How to stop Backscatter (NDR) from spoofed Mail address?

some one is sending mails from a spoofed mail account from our domain ([email protected]) to hundreds, sometimes thousands of non existant russian E-Mail addresses. The web hosts send out NDRs ...
Rimini's user avatar
  • 31
1 vote
2 answers
3k views

Single User cannot send email to public folder - exchange 2010

I have a single internal user who is receiving the following NDR when sending mail to a mail enabled public folder. It is fine for all other users, internal and external. I'm waiting to hear back from ...
Greg Arnold's user avatar
1 vote
0 answers
792 views

Exchange 2010: not receiving NDR when sending email using SMTP to none existing external mailbox

We are sending email using smtp port 25 in a local Exchange 2010 server We do not set username nor passwords in the SMTP connection, only "form" address. Mails are sent to external recipients after ...
Roeya's user avatar
  • 11
1 vote
0 answers
738 views

Exchange 2013 NDR attack

Recently I setup an exchange server 2013 sp1 on windows 2012 R2 and now it is under reverse ndr attack. I just have one server with Mailbox server role and CAS role on it. I don't want to disable ndr ...
user215348's user avatar
1 vote
1 answer
881 views

Exchange 2010 oversized mail notification

Earlier we have Exchange 2003. In exchange 2003 when set the maximum size of sending / receiving mail, we can set an e-mail address where we see a notice if we have an undeliverable mail. Now we ...
holian's user avatar
  • 227
0 votes
2 answers
3k views

550 5.1.1 relay denied NDR Error

I'm having problem with my email getting rejected like the following NDR, can anyone know or help me how to prevent this blockage please ? From: Administrator Sent: Monday, 1 November 2010 3:35 PM ...
Senior Systems Engineer's user avatar
0 votes
3 answers
535 views

How to delist DNSBL?

Can not send email to some email addresses that it looks like they are using Office 365. The NDR message is coming from DnsConnectorDelivery which is: [{LRT=11/6/2020 12:11:09 PM};{LED=451 4.4.0 ...
Tarek Salah's user avatar
0 votes
1 answer
110 views

Configure server to ignore NDRs to forged addresses/domains

AT&T's Blacklist site suggests one option of correcting mail server issues is: Reconfigured server to ignore NDRs to forged addresses/domains However, NDRs are returned to the sender by their ...
Michael Yaeger's user avatar
0 votes
1 answer
2k views

Reverse DNS entry for sending secure email?

I'm having problem like the following when I tried to send to [email protected]: Diagnostic information for administrators: Generating server: mail.domain.com [email protected] mail....
Senior Systems Engineer's user avatar
0 votes
1 answer
10k views

What software generates the SMTP bounce message "550 Envelope blocked - User Entry"?

I'm troubleshooting an issue where email sent from a specific user is blocked every time to only a specific sender. The NDR generated (from our Exchange server) has the following message: #550 ...
joelsand's user avatar
  • 121
0 votes
1 answer
120 views

SBS migration: NDRs when sending email to olddomain.local addresses

Just swapped in a new SBS 2008 server today. Did not perform a migration this time (old server was a mess), but chose a completely new domain and migrated everything over manually. Went well, only ...
gravyface's user avatar
  • 14k
0 votes
1 answer
494 views

Exchange Server 2003 random NDR's and DNS

We run an Exchange 2003 email server which also doubles as a SDC / DNS server. The PDC also serves DNS requests too. Every now and again an email will fail. Where the email is going to or coming from ...
JohnyD's user avatar
  • 1,624
0 votes
2 answers
871 views

Exchange - No NDR

I try to send a test email from my personal email account to a non-existent email in my company's domain. I don't receive NDR at all. I'm under Exchange 07 SP1. Where can I configure it ? Thx for ...
Bastien's user avatar
  • 29
0 votes
4 answers
3k views

SBS 2003 suddenly not delivering emails to outside domains

This afternoon our server in the office suddenly started refusing to deliver mail to outside domains - email for our domain is still delivered. I've tried Googling around and I can't find anything ...
user avatar
0 votes
1 answer
583 views

Exchange 2010 distribution group, NDR message not being sent to original sender, when unauthenticated option in place

We got a requirement to reject external emails sent to one distribution group ([email protected]) using exchange 2010 transport rule in this manner. (and send NDR to the original external sender) We ...
Aravinda's user avatar
  • 1,111
0 votes
0 answers
731 views

Postfix - disabled notifications for 535 5.7.8 Error: blocked

I have an anti-spam system based on 'postfix'. When someone sends an email and is blocked by a blacklist, they get feedback. Example below: This is the mail system at host mail.xxx.com. I'm sorry to ...
cezar's user avatar
  • 1
0 votes
1 answer
135 views

VERP: rewrite from header of NDR?

We provide cmail delivery for external clients from several different domains. We rewrite the envelope sender (AKA: "SMTP MAIL FROM","Return-Path" ) using a form of VERP. Thus we ...
Jasen's user avatar
  • 916
0 votes
2 answers
2k views

Can I redirect all of the NDRs for my domain to a central mailbox in Exchange Online?

At my company our ticketing system pulls from dedicated mailboxes, but when an email is sent from one of them due to some automated process or other and fails it of course throws an NDR. The problem ...
Rev.Felix's user avatar
0 votes
1 answer
700 views

how to stop postfix relay server to forward bounce/NDR emails to client

I have a setup with 1 pure mail server, lets call it mail, and 1 web server, lets call it web. When web sends out email to an external server it uses mail as relay. Both servers use postfix. mail has ...
Matthias's user avatar
  • 179
0 votes
1 answer
524 views

Postfix - Non delivery report for specific source address when sending to specific target address

Using Postfix (version 2.10.2.2, part of a Zimbra installation) on Ubuntu I would like to be able to achieve the following: If an email originates from [email protected] that targets userB@example....
HenningM's user avatar
0 votes
0 answers
663 views

IIS 6.0 SMTP not sending NDR to user from web application

We have a web application that is configured to use an internal mail relay running on Windows Server 2012 R2, IIS 6.0 for the SMTP though. I just put this server in place as a replacement for an old ...
Thorin's user avatar
  • 209
0 votes
1 answer
101 views

Google gmail block for no ptr of 4to6 ip address

When mail server got only ipv4 address and enabled 4to6 interface, gmail server block mail because of no ptr record of 4to6 address. Why...? Isn't 4to6 address not global standard...?
kj.park's user avatar
  • 46
-1 votes
1 answer
28 views

Exchange Hybrid Intermittently giving NDRs

New year, looks like a pretty active site. My company has a Hybrid config in place that cannot be removed at the moment. Since the 22/04 we have been having problems that certain domains ...
Steve Roberts's user avatar