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https://docs.microsoft.com/en-us/exchange/troubleshoot/mail-delivery/imceaex-ndr
When you send email messages to an internal user in Microsoft Office 365, you receive an IMCEAEX non-delivery report (NDR) because of a bad LegacyExchangeDN reference. The IMCEAEX NDR indicates that the user no longer exists in the environment. Cause. This issue occurs because the value for the LegacyExchangeDN attribute changed.
https://medium.com/365uc/imceaex-ndrs-and-how-to-solve-them-9876dec3537
Oct 19, 2018 · Got an IMCEAEX non-delivery report (NDR) and don’t know what to do to fix it? Read this to find out why it happened and how to resolve it.
http://www.techrid.com/exchange-server-2010/mailflow/imceaex-error-non-delivery-report-when-you-send-email-messages-in-exchange-2007-2010/
Aug 24, 2014 · User unable to Send email, email bounce back with the below error: Error : To isolate the issue . 1: Checked if the user is in Disabled account in Directory Services ...
https://community.spiceworks.com/topic/369177-delivery-has-failed-imceaex-but-not-cached-address
Aug 13, 2014 · I'll start by saying I don't think this is related to the normal IMCEAEX errors where the client caches old addresses. This still happens in OWA and when the cache is cleared. The Cause: I got a ticket saying the Global Address List was not updating for new external contacts.
https://en.wikipedia.org/wiki/Non_delivery_report
A bounce message or just "bounce" is an automated message from an email system, informing the sender of a previous message that message had not been delivered (or some other delivery problem occurred). The original message is said to have "bounced". More formal terms for bounce message include "Non-Delivery Report" or "Non-Delivery Receipt" (NDR), [Failed] "Delivery Status Notification" …
https://identitydude.com/2015/03/27/imceaex-non-delivery-report/
Mar 27, 2015 · IMCEAEX non-delivery report. Posted on March 27, 2015 September 4, 2018; by dkegg; In Exchange Online; When migrating from on-prem Exchange to Office 365, it's best to treat it like any other cross-forest move and populate each object's LegacyExchangeDN value as an X500 address, otherwise you'll get NDR errors replying to old messages or ...
http://msexchangeguru.com/2012/03/15/x500/
46 Responses to “Mystery of adding X500’s – What an amazing thing to know…!!!” Wizkid Says: March 15th, 2012 at 1:57 pm. This is a know issue becuase of the legacyexchangeDN being used by exchange to send internal emails. So you just need to add legacyexchnagedn of old user to the x500 of the new user with the same email id.
https://www.thecloudtechnologist.com/powershell-script-to-automatically-heal-non-deliverable-emails-ndrs-as-x500/
PowerShell script to automatically heal non-deliverable emails (NDRs) as X500. One of the possible causes for a non-delivery report (NDR) is when a mail object in Exchange is moved or removed (Contact, Mailbox, MailUser, etc). When an object is moved, any internal user who had previously emailed that object will have a cached entry in their ...
https://www.experts-exchange.com/articles/29270/IMCEAEX-NDRs-after-migrating-PSTs-to-Exchange-or-Office-365.html
IMCEAEX non-delivery report when you send email messages to an internal user in Office 365 dedicated. The first method in the article would cause the IT staff to contact each user to help them clear their Outlook name cache, however, it wouldn't have worked since these were brand new Outlook profiles, in a brand new domain, on brand new machines.
http://msexchangeguru.com/2018/12/06/ex16-ndr/
One in particular deserves special mention; the IMCEAEX non-delivery report. This NDR will occur when the LegacyExchangeDN attribute has changed for a recipient. A common reason for the attribute changing is when a user has left the organization, and their mailbox has been removed, and then they have later re-joined the organization and had a ...
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