Use PowerShell to Send Messages from Shared Mailboxes, Groups, and Distribution Lists

Everyone probably knows how to use Exchange's Send As and Send on Behalf of permissions to send email from user mailboxes. Here we venture into the same task, but for Microsoft 365 Groups, shared mailboxes, distribution lists, and mail-enabled security groups. Once your permissions are aligned, everything is pretty simple.

https://practical365.com/sendas-send-on-behalf-of-mail-objects/