Microsoft 365 email not arriving

  • Resolved worldsdream

    (@worldsdream)


    1 year, 5 months ago

    Hi there,

    I configured fluent SMTP with Microsoft 365 (Azure).

    The configuration shows that everything is completed. But, when I sent an email, it tells that it’s sent, but it’s not coming in my gmail/hotmail/and other email providers.

    So I can’t see what’s happening to fix this. Can you help me out?

    Thanks.

Viewing 5 replies - 1 through 5 (of 5 total)
  • Plugin Support Amimul Ihsan Mahdi

    (@amimulihsanmahdi)

    Hi there,

    Would you please check the Email Log in Fluent SMTP and click on a specific email? After that, please select Technical Information as shown in the screenshot and provide us a screenshot of the tab.

    Let us know the update.

    Thank you

    Hello,

    Had exactly the same issue.

    Configured MS 365 via the tokens and everything was shown as ok.
    Tried a test email and it returned success, however, no emails were sent. Tried again same thing. Nothing in the logs.

    I finally switched to using the SMTP (again through ms 365) and everything works fine. The test emails were indeed sent this time.

    I think something weird must be happening that needs to be checked.

    Upon further investigation, the sending email seems to have received an email from Microsoft mentioning:

    Delivery has failed to these recipients or groups:
    [my receiving email used in testing]

    Your message wasn’t delivered because the recipient’s email provider rejected it.

    Diagnostic information for administrators:

    Generating server: […..].PROD.OUTLOOK.COM

    Remote server returned ‘550 5.7.708 Service unavailable. Access denied, traffic not accepted from this IP. For more information please go to https://go.microsoft.com/fwlink/?LinkId=526653 AS(7230)

    After checking the Microsoft link and the info for further details it mentions:

    5.7.708 Access denied, traffic not accepted from this IP

    This error can happen when you are trying out a Microsoft 365 trial tenant. If you receive this error before you can purchase licenses, contact support to request an exception for the low reputation IP address until you’re able to purchase licenses.

    https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-5-7-700-through-5-7-750#57708-access-denied-traffic-not-accepted-from-this-ip

    Indeed, this MS 365 is a new account and the client is actually still using the trial version.
    So it seems that this could cause issues like that

    Thread Starter worldsdream

    (@worldsdream)

    @lyk-1 I can confirm that sending through SMTP works, and through Microsoft Graph with a trial or developer account doesn’t work.

    When using it with a bought licensed, it works.

    I have also contacted support through 365 admin and they have made some changes on their end that should fix the issue, even with the trial accounts.

    So in similar cases, 365 admins can contact support and request a fix regarding the issue.

Viewing 5 replies - 1 through 5 (of 5 total)
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