Cant send smail to outlook , hotmail , microsoft domains

Syed Afsar Afsar 20 Reputation points
2024-05-13T07:38:54.51+00:00 rejected your message to the following email addresses: ( Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept email from certain senders, or another restriction may be preventing delivery. gave this error: Unfortunately, messages from [] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to [ 2024-05-13T07:34:58.800Z 08DC724904F65239]


Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Jake Zhang-MSFT 1,535 Reputation points Microsoft Vendor

    Hello @Syed Afsar Afsar,

    Welcome to the Microsoft forum for technical support.

    Based on your description, I have a few questions to confirm with you:

    1. Are you using Exchange Server?
    2. Because many email systems prevent you from sending emails, are your SPF, DMARC, and DKIM records set correctly?

    If your settings are correct, it may be that your IP address has been blocked. You can choose the following methods to remove your IP address from block list:

    1.For or accounts, you can fill in the relevant information through this link: New support request (  to seek to remove your IP address from the block list.

    2.If you are also having issues sending to recipients with email addresses in Microsoft 365, you can use the removal portal (Delist IP - Delist IP ( to remove yourself from the blocked senders list delete.

    Please feel free to contact me if you have any queries.


    Jake Zhang

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  1. Syed Afsar Afsar 20 Reputation points

    Dear Jake Zhang,

    we are using exchange server 2016 on premises , our SPF DKIM and DMARC passes all the tests ... our ip is clean not blocked by microsoft domain as it says and still we are facing the same issue .

    we filled up the form for new support request the request number is 7041391687.

    Hope MSFT team will solve the issue as soon as possible.

    please revert back ASAP

    thanking you