My understanding of bulk edit is:
Advanced Find -> Select all records that I want to edit -> make specific changes.
However, in the email entity I get a different 'form' (?) for my bulk edit, and am not able to edit the fields I want to edit.
Essentially, I want to set up a lookup to the corresponding Accounts so that the data is filled out entirely. I imagined it to be as simple as select the fields to edit, BUT in Advanced Find Edit "change multiple records" I do not have an entry for Senders Account.

Also, when I Import from Excel I do not see the corresponding field in D365 to map to....

...there are not Dynamics 365 Entity Fields to match it.
How may I add in these Senders Accounts, to complete my database?