send as using the mailer

Jasmeet Singh Johar 20 Reputation points
2026-06-25T08:58:39.9166667+00:00

i have created the mailer which is working fine on mail web to use as send as but not working on outlook app

[PII: Removed]@cisco.com

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A powerful email and collaboration platform developed by Microsoft, designed to support enterprise-level communication and productivity. Miscellaneous topics that do not fit into specific categories.

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Anonymous
2026-06-29T08:47:33.0266667+00:00

Hi Jasmeet Singh Johar,

Thank you for the additional information. The error message [0x80070005-0x000004dc-0x00000524] usually indicates that "This message could not be sent. You do not have the permission to send the message on behalf of the specified user." 

I understand that sending works as expected in webmail using the “send as” option, and the issue only occurs in Outlook on Windows. 

To better understand your situation, may I kindly ask for some clarification: 

1/ Could you please describe how the mailer was created? For example, is it an alias or a shared mailbox, and how was the “send as” permission assigned? 

Also, does this mailer appear in your organization in the Microsoft Admin Center? 

2/ Could you confirm which version of Outlook is being used, Classic Outlook or the new Outlook? 

3/ Would you be able to share a screenshot of the issue through private message? 

Please check your inbox for an email with the subject “New private message on Microsoft Q&A question” to review my response. Then select “View message” in the banner above the post to access the private message chat. 

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If I’ve misunderstood any part of your situation, or if you have further questions or updates, please don’t hesitate to reply. 

Thank you for your time, and I look forward to hearing from you soon. 

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  1. Victor1-V 13,025 Reputation points Microsoft External Staff Moderator
    2026-06-26T08:50:50.77+00:00

    Please note that our forum is a public platform, and I modified your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data. 

    Hi Jasmeet Singh Johar,

    To better understand the issue, could you please clarify a few details?

    1. Are you using a personal Outlook.com account, or a Microsoft 365 work/school account?
    2. Which Outlook app are you using: classic Outlook for Windows, new Outlook for Windows, Outlook for Mac, or Outlook mobile?
    3. When you say you created the “mailer,” is it an alias, shared mailbox, distribution list/group, or another mailbox address?
    4. In the Outlook app, what exactly happens when you try to send as that address? For example, is the address not shown, does it send from your main address instead, or do you receive an error?

    Since Send as works in Outlook on the web, the setup may be correct on the server side, but the Outlook app behavior can vary depending on the account type and app version. Once you share the details above, we can suggest the most relevant next steps.

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