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User can not send invite to outside our domain

Anonymous
2022-12-05T08:34:15+00:00

Hello

one of the user's in our domain can not send a invite to external e-mail i'm looking for this problem in the admin center but i did not find a solve for this problem.

Thank's

Outlook | Web | Outlook on the web for business | Security

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Anonymous
2022-12-05T10:34:50+00:00

Hello M.U.F.C,

Good day! Thank you for posting to Microsoft Community. We are happy to assist you.

Based on your description, I understand that your issue is that a user can not send an invitation to an external recipient, getting NDR error:5.7.703 Your message can’t be delivered because one or more recipients are blocked by your organization’s tenant recipient block policy.

The NDR error5.7.703 is always generated when one or more recipient of the emails are blocked by the organization’s tenant block list. If you want to remove the recipient from the block list, please refer to the steps below:

  1. In the Microsoft 365 Defender portal at https://security.microsoft.com, go to Policies & rules > Threat Policies > Rules section > Tenant Allow/Block Lists. Or, to go directly to the Tenant Allow/Block List page, use https://security.microsoft.com/tenantAllowBlockList.
  2. On the Tenant Allow/Block List page, verify that the Domains & addresses tab is selected.
  3. Check the rules which blocked your recipient. Select it and click Delete 
       [![](https://learn-attachment.microsoft.com/api/attachments/bdcab9f8-d9c8-48d3-9b8c-933e113f54f7?platform=QnA"https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/tenant-allow-block-list-email-spoof-configure?view=o365-worldwide" rel="ugc nofollow">Allow or block email using the Tenant Allow/Block List - Office 365 | Microsoft Learn
    

    Hope the information I provided make sense to you, if you need further support, please reply to this thread, we will continue assist you.
    

    Wish you all the best!
    

    Sincerely,
    

    Sherry | Microsoft Community Moderator

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  1. Anonymous
    2022-12-06T07:40:28+00:00

    Hi M.U.F.C,

    I'm glad to see your reply and it's my pleasure to assist you on your issues. I was wondering whether my suggestion worked for your scenario. If you need more information or support, I feel glad to work on it further.

    And if my suggestion can help to clarify the issue, could you please help to submit feedback （vote for my answer） in order to help more others who have similar issues.

    Thanks so much for your time and patience.

    Sincerely,

    Sherry | Microsoft Community Moderator

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  2. Anonymous
    2022-12-06T07:22:08+00:00

    Hello

    i would to tell you that i very thankful for this information.

    Kind regards

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