Fix NDR error "550 5.7.133" in Exchange Online
Jun 25, 2025 · Learn how to fix email issues for error code 5.7.133 in Exchange Online (the group recipient is configured to reject messages from external or unauthenticated senders).
O365/Exchange 2016 Hybrid - Microsoft 365 group cannot …
Mar 2, 2022 · We have an Exchange 2016 and O365 hybrid environment. We have several converted Microsoft 365 groups that cannot receive external e-mails, even though “Let people …
Allow External Senders to Email This Group - Easy365Manager
The root cause of this issue is that distribution groups do not accept emails from external senders by default. Fixing this error with Easy365Manager is very easy: Open up Active Directory …
problem in sending email via SMTP service not as external senders
Jun 14, 2019 · The problem was due to manage delivery setting. You should change the delivery management option for “your distributed email” distributed list from “only senders inside my …
Office 365: Delivery Has Failed to These Recipients or Groups
Jul 26, 2015 · When an external sender attempts to send an email message to an Office 365 group they may receive a non-delivery report (NDR). The NDR states: Your message couldn’t …
How to troubleshoot the SenderNotAuthenticatedForGroup error …
Jun 14, 2016 · Typically, the solution to this problem is to disable the sender's authentication requirement in the recipient's Exchange. To do that, follow the steps below: In Exchange on …
Group Won’t Accept Mail From ‘Outside’ | PeteNetLive
Exchange has been this way for a long time here’s me explaining this very problem with older versions of Exchange. If you create a ‘Group’, be that a Distribution Group, or a ‘Microsoft 365’ …
On-Prem Mailbox Unable to Send to 365 Group : r/Office365
Jun 21, 2021 · In the first scenario your on premises resources would never be aware of the group and in the second scenario if you created it in the 365 portal directly it will never resolve the …
"Delivery restriction check failed because the sender was not ...
Jun 18, 2024 · Typically, this error message means that the distribution group has restricted the sender's emails.
Delivery has failed to these recipients or groups - osTicket
Oct 18, 2019 · Your message couldn't be delivered because delivery to this group is restricted to authenticated senders. If the problem continues, please contact your email admin.