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Here is the back story. A client left our company. We hosted their emails on our hosted exchange 2016. Their emails are now on O365 with a new vendor. I deleted all of the email accounts in our hosted exchange using the exchange management shell (Can't access EAC at the moment and trying to figure out how to fix this issue) as well as the AD accounts. When we try to send email to the old client, we get this error: IMCEAEX-_o=First+20Organization_ou=Exchange+20Administrative+20Group+20+28FYDIBOHF23SPDLT+29_cn=Recipients_cn=165eaa177e6e462bacbdbd888964e213-Lara@datadynamics-inc.com
Remote Server returned '550 5.1.11 RESOLVER.ADR.ExRecipNotFound; Recipient not found by Exchange Legacy encapsulated email address lookup'
What's also interesting is that I am sending an email to lglauber@decipherglobal.com, not Lara@datadynamics-inc.com. I only deleted the decipherglobal.com emails from our server. We still have our datadynamics-inc.com email accounts on our hosted exchange.
I've read some articles about adding X500, but these email accounts are no longer on our hosted exchange, but now hosted by another provider in O365. We still need to be able to send emails to the old client. Is there a way to clear the cache or something for these email accounts in our hosted exchange environment using the exchange management shell since I can't get into EAC?
Thank you for all of your help. After removing the email address policy and the accepted domain, the emails are getting delivered to the old client.
Awesome. If you dont mind, please mark an answer as accepted so we can close this up. Thanks!
Will do. I wish you could help me figure out why I can't get into EAC or OWA.
Hey, can you create a new question for that with all the details? that will help people jump on it. thanks!
I did a couple days ago, but haven't received much help:
Which client? If from Outlook, then the caching is actually happening within Outlook:
https://learn.microsoft.com/en-us/outlook/troubleshoot/contacts/information-about-the-outlook-autocomplete-list#how-to-clear-the-whole-autocomplete-list
We are using outlook. I did both methods from the article, but email still getting rejected:
Diagnostic information for administrators:
Generating server: MX20.datadynamics-inc.com
lglauber@decipherglobal.com
Remote Server returned '550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient not found by SMTP address lookup'
Ok, thats a different error.
Did you remove the accepted domain from your Exchange?
MX20.datadynamics-inc.com
is tellnig you that it doesnt exist.
Tried to, but got this error:
[PS] C:\Windows\system32>Remove-AcceptedDomain decipherglobal
The operation couldn't be performed because object 'decipherglobal' couldn't be found on 'PDC.datadynamics-inc.com'.
+ CategoryInfo : NotSpecified: (:) [Remove-AcceptedDomain], ManagementObjectNotFoundException
+ FullyQualifiedErrorId : [Server=MX20,RequestId=e88822a6-f962-45f5-b5d0-523dfb2dc399,TimeStamp=6/23/2022 12:41:41
PM] [FailureCategory=Cmdlet-ManagementObjectNotFoundException] 879BB128,Microsoft.Exchange.Management.SystemConfi
gurationTasks.RemoveAcceptedDomain
+ PSComputerName : mx20.datadynamics-inc.com
Also what is strange is that it tells me that the object doesn't exist, but if I try to create a new one, it says it already exists:
New-AcceptedDomain -DomainName decipherglobal.com -DomainType ExternalRelay -Name Decipher
The accepted domain decipherglobal.com already exists.
+ CategoryInfo : ResourceExists: (Decipher:AcceptedDomain) [New-AcceptedDomain], DuplicateAcceptedDomainE
xception
+ FullyQualifiedErrorId : [Server=MX10,RequestId=be6092e6-65ea-4aa2-9cbc-eb9e78a43589,TimeStamp=6/23/2022 1:43:02
PM] [FailureCategory=Cmdlet-DuplicateAcceptedDomainException] 5B2E6C21,Microsoft.Exchange.Management.SystemConfigu
rationTasks.NewAcceptedDomain
+ PSComputerName : mx10.datadynamics-inc.com
Who manages the mail datadynamics-inc.com?
Thats who is saying it doesnt exist. You may need to make a change there so the emails are correctly handled.
RIght now that domain is using Barracuda. You may need to make a change there.
Thanks, I manage the hosted exchange, but I'm not an exchange guy :). We use Barracuda for spam filtering. I will reach out to Barracuda.
I reached out to Barracuda to verify, but the emails I try sending to deciphergobal.com are not even getting out from the exchange server to Barracuda, so the issue is on my hosted exchange servers, not Barracuda.
I reached out to Barracuda to verify, but the emails I try sending to deciphergobal.com are not even getting out from the exchange server to Barracuda, so the issue is on my hosted exchange servers, not Barracuda.
deciphergobal.com doesnt exist in DNS . It should be set to Exchange Online if they moved there
https://mxtoolbox.com/SuperTool.aspx?action=mx%3adeciphergobal.com&run=toolpage
So the new vendor needs to do this on their side? Sorry, I'm a little confused.
Yes, whomever supports them now will need to do this.
I just realized you have a typo, It's decipherglobal.com. The "L" was missing. DNS is setup:
https://mxtoolbox.com/SuperTool.aspx?action=mx%3adecipherglobal.com&run=toolpage