In phpList you would set reply to etc in the email settings (it’s generally the same as From:)
Then attributes like NAME would be in the subscriber profile for an individual, so I am Anna and if you send an email to me with [NAME] that would be replaced by ANNA.
the From attribute you mention is a little more confusing. Usually that would be from YOU, so you would type it, though there are some placeholders which can refer to you, that add your url for example.
Right generally the email we use to send to the list is the reply to.
However in the case of my scenario:
We have List A (which is the Client List) and we have List B (which is the Clients Customer List).
What i need to do is send an email to the Customer List (List B) with Place Holders (or attributes) that are from List A the client list (i.e client details, website etc)