Forum Discussion
Exchange - Undeliverable Emails
I have a single Microsoft Exchange account (to allow me to sync addresses, calendars, notes etc across a range of windows and android devices).
The email for this account is xx@domainname.onmicrosoft.com.
I also have a number of email adressess at my company domain : xx@domain.com
If I try to send emails from xx@domainname.onmicrosoft.com to any email address at xx@domain.com I get an "undeliverable" message stating :
"Your message to xx@domainname.com couldn't be delivered. xx wasn't found at domainname.com."
Any suggestions as to why this is happening would be most welcome.
Thanks
SB
Hello sjb66
Could you please check the email delivery using the online Microsoft tool : testconnectivity.microsoft.com and see the exact issue you face
Thanks,
Manu
Which server is generating the NDR? It might be a simple case of you having a matching contact within your directory, causing the message to be routed incorrectly. Also, run a message trace: https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/message-trace-scc?view=o365-worldwide
Thanks for the suggestions. I had a look at the Office 365 Security & Compliance message trace utility and I wasn't able to run it but I think it shows where the problem is.
I'm logged in as xx@domainname.onmicrosoft.com but the default queries in the message trace section all refer to xx@domainname.com clearly the system is somehow confusing the two accounts.
My primary Microsoft account (for Microsoft 365, Onedrive etc) is under xx@domainname.com . the Exchange account is (because it has to be) under xx@domainname.onmicrosoft.com .
Hi, is the xx@domain.com added to your Office 365 tenant as an accepted domain please, or is it residing elsewhere, such as an on-premises Exchange Server?
PeterRising There is no connection between them at all apart from the fact I access both of them via Outlook on Microsoft 365.
xx@domian.com is on a 3rd party supplier, web host server, and is not an "exchange" server.
