Exchange Hybrid - internal users cant send e-mail to cloud only group

HanakJ 86

Hello
In Exchage Hybrid scenario, On-Premise user mailbox wants to send e-mail message cloud only group. Cloud only group is distribution list, with primary smtp adress GroupA@keyman .com, aliases are groupA@keyman .onmicrosoft.com and group@keyman .mail.onmicrosoft.com, also "Senders inside and outside of my organization" is true.

When On-Premise mailbox write address GroupA@keyman .onmicrosoft.com Outlook said this address is invalid, when user send it, he gets NDR '550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient not found by SMTP address lookup'.

On-Premise in accepted domain is domain.com Authoritative domain type...

Thanks for any advices

Andy David - MVP 142.3K Reputation points MVP

2021-02-05T20:26:59.683+00:00

Is domain.onmicrosoft.com an accepted domain on-prem? It shouldnt be.
HanakJ 86 Reputation points

2021-02-05T20:44:31.423+00:00

I have domain.mail.onmicrosoft.com in accepted domains this domain is Internal relay domain type.
HanakJ 86 Reputation points

2021-02-05T21:00:37.567+00:00

If I write Group@keyman .com Outlook will said this address is invalid...
I dont know, how this work, maybe the group needs to be On-Premise.
Andy David - MVP 142.3K Reputation points MVP

2021-02-05T21:45:45.72+00:00

Does it work sending to GroupA@keyman .onmicrosoft.com from an external account like gmail.com ?

CAn you post the complete NDR minus any personal info
HanakJ 86 Reputation points

2021-02-05T23:14:57.683+00:00

Yes it does work. GroupA@keyman .onmicrosoft.com, GroupA@keyman .com was ok, I send it from gmail.com.

GroupB@keyman .com
Remote Server returned '550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient not found by SMTP address lookup'
Andy David - MVP 142.3K Reputation points MVP

2021-02-06T12:36:34.247+00:00

Is there an Edge Server or other SMTP gateway between your on-prem org and 365 that may be routing domain.onmicrosoft.com incorrectly?
HanakJ 86 Reputation points

2021-02-06T15:40:56.847+00:00

I have two Edge servers.

I want to ask them at all possible if I have a mailbox in On-premise and send an e-mail to a group that is only created in AzureAD in Exchange Hybrid. In On-Premise, this group is nowhere at all.
Andy David - MVP 142.3K Reputation points MVP

2021-02-06T15:53:27.34+00:00

Absolutely it should work.
If you send to a onmicrosoft.com address from on-prem, it should go out the send connector to 365 unless you have configured something incorrectly.

I would do a message trace.

What is set for your send connectors for the remote domain (Address spaces)
Also, please post the exact NDR without any personal info,
Olivier Chantraine 96 Reputation points

2021-02-10T09:41:50.347+00:00

Hello,

As the domain.com is autoritatif, it will only send email for known objet on exchange onprem server.

for me, you have to change autoritatif to internal relay, and make a send connector for domaine.com to your tenant.

Olivier

1 answer

Lucas Liu-MSFT 6,161 Reputation points

2021-02-08T08:08:49.737+00:00
Hi @HanakJ ,
Can successfully send emails to User mailbox in Exchange Online ?
Did you try to create a new distribution list in Exchange Online and send an email to it?

If you enable the “Auto-Complete” function, please try to click the “X” when you type the recipient mailbox address and manually to type the mailbox address.

Please make sure that the connector configuration in Exchange online is correct. If you choose the Full Hybrid configuration when you run HCW, then the connector will be automatically configured for you.

Please make sure there is no exists related transport rule could affect the mail flow.
For more information you could refer to: Fix email delivery issues for error code 550 5.1.10 in Exchange Online

In addition, please share the complete NDR report with us, but please note that covering your personal information.

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1 person found this answer helpful.
Lucas Liu-MSFT 6,161 Reputation points

2021-02-10T09:29:57.49+00:00

Hi @HanakJ ,
Do suggestions above help? If the issue has been resolved, please click “Accept as answer” to mark helpful reply as an answer, this will make answer searching in the forum easier and be beneficial to other community members as well.

Thanks for your understanding.

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Lucas Liu-MSFT 6,161 Reputation points

2021-02-15T04:41:02.47+00:00

Hi @HanakJ ,
I am writing here to confirm with you how thing going now? If the above suggestion helps, please click “Accept as answer” to mark helpful reply as an answer.Your action would be helpful to other users who encounter the same issue and read this thread.
Thanks for your understanding.

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