Microsoft 365 Exchange Error Code 5.7.703 – Your message can’t be delivered because one or more recipients are blocked by your organization’s tenant recipient block policy

In this post, let’s have a look at the error message “5.7.703 – Your message can’t be delivered because one or more recipients are blocked by your organization’s tenant recipient block policy” 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

5.7.703 – Your message can’t be delivered because one or more recipients are blocked by your organization’s tenant recipient block policy

Error Details

Someone in your organization sent mail to an email address or domain that’s blocked in the Tenant Allow/Block List. The entire message is blocked for all recipients of the message, even if only one recipient email address or domain is defined in a block entry.