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usabletech avatar Server

Mailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as this sender

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usabletech

I have an issue where a new mailbox in Exchange Online is reporting Mailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as this sender when sending mail from an app server.

using these settings, values changed for security:

<mailSettings>
      <smtp from="[email protected]">
      <network host="ipaddress" port="25" userName="[email protected]" password="password" defaultCredentials="false" />
     </smtp>
    </mailSettings>

Do you have any ideas what would cause this?

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Joy Zhang avatar Server
us flag
Joy Zhang

Which type mentioned in the guidance do you use to send mails through app server?

Check the guidance and make sure the prerequisites are configured correctly and then check if this issue continues. Here's a screenshot on comparing these 3 methods for your reference and it will be helpful for you to choose the better method:enter image description here

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