SMTP Relay Server in Office 365 RRS feed

  • Question

  • Hi!

    Is there a workaround if I am trying to send email using my mail sending applications relayed to Office 365 via SMTP Relay Server if the sender is not in the accepted domain in Office 365?


    Accepted Domain - contoso.com

    Sender - no-reply@hostname.contoso.com

    Error: 550 5.7.64 Relay Access Denied ATTR3

    Was able to send the email to domains that are using Exchange Online but for organization using Zimbra, Gmail and Yahoo we always encounter Bad Mail error in the SMTP Relay Server. 



    Mary Yvette Bulaong

    • Edited by Mary Yvette Monday, February 3, 2020 9:04 AM
    Monday, February 3, 2020 7:58 AM


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