Forum Discussion
Microsoft Office 365 Error: "Delivery has failed to these recipients or groups"
Preeti321 Any specific reason you want to send emails from your Tenant Address and not your own Custom Domain ?
Please go through FAQ for Domain in Office 365 - https://docs.microsoft.com/en-us/office365/admin/setup/domains-faq?view=o365-worldwide
Additionally, are you a Microsoft Vendor (working for Support Projects) worldwide? If yes - Please reach out to your Technical Advisor for unblocking the Test Tenant you own, internally !!
If not, and you are only using it for your Own Learning and testing, you should not use domain.Onmicrosoft.com address for sending emails (except) testing.
Please delist your Tenant and IP by opening a Microsoft Support ticket.
Cheers !
Ankit Shukla
Preeti321 The Error clearly confirms, that due to Too many Spam email sent on the specific domain has been Flagged, and Tagged on SpamHaus (Global Directory) for IP Blacklisting. Additionally you should not be sending emails form domain.onmicrosoft.com (Tenant Address) and instead should use Custom domain name. this not only tags your Tenant address as Blacklisted (for Spam Abuse) but also blocks specific IP (outbound) through which emails are relayed over to Internet.
Cheers !
Ankit Shukla
I didn't send any Email to anyone yet. Can you tell me where I can check the Email information whether I will check in the Exchange admin center or anywhere else?ankit shukla