Please try resending the message. Thank you so much in advance for your help. failed to these recipients or groups: outmails2015@gmail.com I have a system with me which has dual boot os installed. Subject: Undeliverable: Fwd: Invoice 3407. Content-Transfer-Encoding: binary 13. Bonus Flashback: March 3, 1969: Apollo 9 launched (Read more HERE.) Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread. Creepy or useful - you decide! We've listed the most common error messages below, along with suggested resolutions. X-Microsoft-Antispam: BCL:0; If you're getting into Viva Sales, we discuss what the new OpenAI GPT add-in does. Please try resending the message. Microsoft SMTP Server (version=TLS1_2, outlook mail - Microsoft Q&A - learn.microsoft.com Must be a common attacker because we got 2 different people from different companies in different cities with the same forwarding email address. Paul is a former Microsoft MVP for Office Apps and Services. John, I get this error when a appication inside my org is trying to send an email to a distribution group in my org. Try sending this message again. If you are using Exchange on-premises, delete/disable all send connectors, then recreate a new with. Delivery has Please check the recipient's email address and try resending this message, or contact the recipient directly. Contact the recipient by some other means (by phone, for example) and ask them to tell their email admin that it appears that their email system isn't accepting connection requests from your email system. Please try resending your message later, or contact the recipient directly. If the email is generated by an application maybe the client account has an incorrect email address attached to it? I decided to let MS install the 22H2 build. DG Sends and email to XYZ and does not receive the NDR? Content-Type: application/ms-tnef; name="winmail.dat" This browser is no longer supported. Delivery has failed to these recipients or groups: employeeb@domain.com. Your message did not reach some or all of the intended recipients.