Email Undeliverable

[Alvin_Pang]

Hi Microsoft Family

I would like ask a question, we sometime send email to "Account A" but will receive Email Undeliverable.

The email account is fine on others features such as MS Teams and Office Application.

I checked Exchange Admin site, "Manage settings for email apps" all Enabled.

What should I do for now? Please advice me.

Thanks all

[#2]

Post the full NDR message here, or run a message trace to get additional details: https://docs.microsoft.com/en-us/exchange/monitoring/trace-an-email-message/message-trace-modern-eac

[#3]

Hi @VasilMichev 

Here you go~~

[#4]

Where does verizonmedia come in play here, does the user has some sort of forwarding configured to yahoo or similar? Forwarded messages can break some of the anti-spam/anti-malware checks and cause a delivery error.

[#5]

Yes, that user configured auto forwarding to yahoo email.
Should I remove it to resolve it the issue?

[#6]

That's up to you to decide, but the NDR above is most likely indeed caused by forwarding breaking some of the checks. Here's an article with more details: https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/anti-spoofing-protection...