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0answers
35 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 ...
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1answer
19 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 ...
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1answer
14 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...?
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0answers
47 views

Custom Transport Agent: How do I collect NDRs and all other undeliverables in Exchange 2010 from the Postmaster?

I'm trying to collect all NDRs in a single mailbox for all invalid recipients, and anything that fails for any reason. I have a custom transport agent, that I've written myself that appears here: ...
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0answers
77 views

Prevent auto forwarding NDR loops

a week ago we experienced a really sweet problem at a client of ours. They are a school with around 1200 users, and everyone of them has auto forwarding for all mail activated. We use Exchange 2010 ...
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0answers
42 views

Postfix config to allow Out-of-office, but not User-not-known

I need our postfix relay to be able to send Out-of-office-replies but not User-not-known bounce messages... both come from "<>" - but the User-not-known ones contain text we could match. Currently ...
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0answers
58 views

Forwarding NDR messages to public folder not working

Masters, We set up the external and internal postmaster e-mail address in Exchange 2010. Now we got a copy from NDR messages. Unfortunatelly we can't set up the postmaster mail adress -- i don't ...
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1answer
142 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 ...
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3answers
3k 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 ...
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1answer
255 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 ...
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1answer
532 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: ...
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0answers
135 views

IIS 6.0 and Virtual SMTP relay ~ some messages are bouncing

I will give a quick overview and then the details. I have a Exchange 2003 environment that I have been asked to slap on a disclaimer on all outgoing mail. So I have setup a Windows 2003 server and ...
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1answer
1k 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 ...
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1answer
302 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 ...
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1answer
4k views

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 ...
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1answer
454 views

Reverse DNS entry for sending secure email?

I'm having problem like the following when I tried to send to abacus@abacusevents.com: Diagnostic information for administrators: Generating server: mail.domain.com abacus@abacusevents.com ...
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1answer
386 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 abacus@abacusevents.com, I got this error message from my email server: Diagnostic information for ...
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1answer
104 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 ...
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2answers
1k 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 ...
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1answer
4k 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, ...
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1answer
382 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 ...
2
votes
3answers
920 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 ...
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2answers
512 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 ...
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2answers
663 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 ...
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4answers
2k 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 ...
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4answers
2k 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 ...
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6answers
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, user@yahoooooo.com, user@gmailyahoo.com, user@homail.com... I want to send a email to all my ...