Remove "via Microsoft" from external id invite email

Hello Nathan Overbey,
Thank you for reaching out to us.

Based on your description I understood that you are looking for option to remove the sender email address of verification email when user signs up.
If you are using Azure AD B2C:

As if now you can only customize banner logo, background color, email signature and nothing else: https://learn.microsoft.com/en-us/azure/active-directory-b2c/faq?tabs=app-reg-ga#how-do-i-customize-verification-emails--the-content-and-the--from---field--sent-by-azure-ad-b2c:~:text=How%20do%20I%20customize%20verification%20emails%20(the%20content%20and%20the%20%22From%3A%22%20field)%20sent%20by%20Azure%20AD%20B2C%3F

You can also completely customize your email using third party email providers such as SendGrid, Mailjet (there is no option to achieve this within Azure directly) have to use these email providers but this requires additional infrastructure and custom policies: https://learn.microsoft.com/en-us/azure/active-directory-b2c/custom-email-sendgrid?pivots=b2c-custom-policy

Custom email verification requires the use of a third-party email provider like Mailjet, SendGrid, or SparkPost, a custom REST API, or any HTTP-based email provider (including your own).

Mailjet - https://learn.microsoft.com/en-us/azure/active-directory-b2c/custom-email-mailjet?pivots=b2c-custom-policy SendGrid - https://learn.microsoft.com/en-us/azure/active-directory-b2c/custom-email-sendgrid?pivots=b2c-custom-policy

Similarly for Azure AD B2B, you can customize the email following the below reference:
https://learn.microsoft.com/en-us/entra/external-id/customize-invitation-api?utm_source=chatgpt.com#suppress-the-invitation-email

If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

Best Regards,

Monalisha