Microsoft Security | Microsoft Entra | Microsoft Entra External ID
Managing external identities to enable secure access for partners, customers, and other non-employees
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How can we change the from email address from B2C? The email which is being sent for "validation code" from Microsoft. We are using user flows.

Hello @skhsjdksjdn-6642 , this can be done using Custom Policies and third-party email providers such as Mailjet, SendGrid, or SparkPost. Take a look to the Custom email verification - DisplayControls sample.
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