HomeMicrosoft OfficeOutlookMicrosoft 365 Exchange Error Code 5.7.136 – Sender was not authenticated

Microsoft 365 Exchange Error Code 5.7.136 – Sender was not authenticated

In this post, let’s have a look at the error message “5.7.136 – Sender was not authenticated” that you get when working with Microsoft 365 Exchange Online.

These are the errors that you usually receive when there is a problem in delivering the email message that was sent by you. These errors are generated and sent by Office 365. This is usually alled as DSN which stands for delivery status notification or in simple words bounce messages.

NDR or Non-delivery report is one of the common type of message that you receive which indicates to the user that the email was not delivered.

Error Message

5.7.136 – Sender was not authenticated

Error Details

The recipient address is a mail user that is set up to reject messages sent from outside of its organization. Only an email admin for the recipient’s organization can change this.

For more information, see Fix email delivery issues for error code 5.7.136 in Exchange Online.

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