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SMTP setup to user another 365 tenant account

Posted on by 16
A customer needs to perform a tenant-to-tenant migration because they have been acquired by another company. The migration will occur in two phases: first, the email and accounts, and then, in a second phase, the BC environments.
So, for a short period, the customer will access BC through the fallback domain x.onmicrosoft.com.
The issue is with the SMTP setup.
How can I ensure that the SMTP setup of the BC environment residing on the x.onmicrosoft.com tenant can send emails using the company.com domain, which in the meantime has been moved to the new 365 tenant?
I tried setting up an account with OAUTH authentication, but it doesn't work. The official documentation is vague, and it seems that this type of configuration may only be used by the On-premise versions of BC.
Any ideas?
  • Suggested answer
    Khushbu Rajvi. Profile Picture
    Khushbu Rajvi. 4,598 on at
    SMTP setup to user another 365 tenant account

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