We can add multiple email sender's addresses after configuring custom domain (https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/email/add-multiple-senders):
Now, I want to do it programmatically with some of the SDKs. Is there any possibilities to do that?

I found examples here: https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/email/add-multiple-senders-mgmt-sdks?pivots=programming-language-csharp