Certain domains not receiving verification E-mails

Question

Some providers do not receive the E-mail verification code:

• • • @magenta.de
• @t-online.de

We are using custom policies and mails are being sent by Microsoft.

Answer 1

Hello,

Try using Message Trace in Exchange Online Admin portal:

Message trace in the modern Exchange admin center in Exchange Online

https://learn.microsoft.com/en-us/exchange/monitoring/trace-an-email-message/message-trace-modern-eac

Check whether they are being received to your e-mail addresses and if they are failing--why they are failing. You may have some policies set up that are blocking these types of e-mails or forcing them to a spam folder.

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