ActiveXperts Knowledge Base Article 7500036
You must disable the 'security defaults' in Microsoft Entra ID in order to use the legacy smtp-legacy.office365.com server.
To do so:
- Open Microsoft Entra Admin Center;
- In the search bar, search for 'Tenant Properties' and open it;
- Click on 'Manage security defaults' and select 'disabled'
You will now be able to use smtp-legacy.office365.com on port 587 using STARTTLS security on your password.
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