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Re: Introducing more control over Direct Send in Exchange Online

Pankaj_Messaging_Specialist's avatar
Pankaj_Messaging_Specialist
Brass Contributor
Jul 15, 2025

Thanks SeanMSFT​. I have another question.

1. As I see this feature is in Public Preview, does Microsoft recommend to Disable RejectDirectSend or wait for GA.?

2. If I go ahead and enable this feature, and if mail flow impacted then send emails will be in queue to resend again or emails will be failed?

3. I am using Exchange Server SMTP Relay which sends email through Printers, devices to O365, can that be impacted?

Published Jul 15, 2025
Version 1.0

1 Comment

  • Arindam_Thokder's avatar
    Arindam_Thokder
    Icon for Microsoft rankMicrosoft
    Jul 16, 2025

    Pankaj_Messaging_Specialist​ -
    1. You can enable it. However, your environment is already protected, so not sure if it will make any difference.
    2. Depends on the sending party, however as it will produce 5XX error, I am almost certain that it will fail.
    3. Depends on if the sender addresses same as your accepted domain and if the email sent through an inbound connector.