Issue with distribution group not receiving external mail (Exchange 2010 Hybrid Setup)

Indie101
Indie101 used Ask the Experts™
on
Hi, have an Exchange 2010 Hybrid setup

I have created distribution list in Exchange console and also distribution group in AD

Synced successfully, tried to send a mail to test@test.com

Get following error

The action 'Set-DistributionGroup', 'RequireSenderAuthenticationEnabled', can't be performed on the object 'media.queries@rtb.ie' because the object is being synchronized from your on-premises organization. This action should be performed on the object in your on-premises organization.

Have unticked Require that all senders are authenticated in Message Delivery Restrictions as sent a test mail and get below error

The group test.test only accepts messages from people in its organization or on its allowed senders list, and your email address isn't on the list.

Any best way to fix it?

Thanks
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timgreen7077Exchange Engineer
Distinguished Expert 2018

Commented:
I have created distribution list in Exchange console and also distribution group in AD

Not sure what you mean with that statement.

anyway did you add anyone in that list of allowed sender? If you did you will need to remove them also and you confirmed that you unchecked the box "Require that all senders are authenticated", so if you have used added as allowed senders you will need to remove them or add the email address of the address being rejected.

Author

Commented:
Thanks Tim there was a distribution group in AD, but in Exchange 2010 console it was set up as a remote user mailbox so had to create brand new distribution list in exchange console

I didnt add anyone to allowed sender, its left at all senders and reject no senders as default

The mail i have is my own and was using for testing, is there a way that i can make those changes show in 365?
RTB-on-premise.PNG
Exchange Engineer
Distinguished Expert 2018
Commented:
A distribution group would not be setup as a remote user mailbox, so you may have an object in O365 with the same email address. If this group isn't needed I would just remove it completely. Setup a new group in Exchange and this group will automatically be created in AD, there is no need to create the group in both places, just create distribution group in Exchange and Exchange will create it in AD.
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Author

Commented:
Thanks Tim, it was carried out onsite i had another question about it

https://www.experts-exchange.com/questions/29119552/Mail-not-being-delivered-to-Distribution-group-in-Hybrid-365-On-Premise-Exchange-2010.html 

It was removed completely I had to setup a new distribution group in Exchange console, thanks yes I should have mentioned that it was in both places

Author

Commented:
Thanks Tim I've done the above still get the message below ( I work for a third party not onsite have asked internal users to check that it works)

The group test.test only accepts messages from people in its organization or on its allowed senders list, and your email address isn't on the list.
timgreen7077Exchange Engineer
Distinguished Expert 2018

Commented:
are you waiting on a response from them?
FOXActive Directory/Exchange Engineer
Top Expert 2015

Commented:
Indie,
1. Open Exchange management shell and run the following command

Get-DistributionGroup -identity test.test | Set-DistributionGroup -RequireSenderAuthenticationEnabled $False

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