I rember that I never seen it and I searched it because in a flow that I have created I'd liked to change it.
I also done a look in the documentation but there is no sign of "From" field, even in the "Send approval email" action.
So i have a SharePoint list to manage Leave Applications. I want the email to be sent FROM the Applicant (SharePoint field) TO the Approver (SharePoint field). How can that be achieved if I cannot set the FROM email address?
I found the answer myself here. The field WAS there but has been removed.
is what I replied to you yesterday, maybe you haven't seen it. However, I don't know if the post is about Outlook for Office 365 Outlook or Outlook.com.
About you question, if you notice, for every action/trigger that you create you sign in with an account, so you have to collect the user credential of the account (if not yours) to correctly fill the "from" field; maybe, you could create a generic account (for example, we use a shared mailboxes) if you haven't the credential of that people.
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