Maybe its possible but i coudnt find it: Having a Tab for 'Transactions' where you can see Transfers made by you and send to you from who and a 'subject'-line.
Technically, we HAVE this. An account's transaction history can be accessed through the economy finder and reverse lookup of either transactions, shops, or accounts through currencies. What WOULD be more useful would be tools to assess markets, transactions and such to know how much trade was done in which currencies, over what period of time - an ECONOMIC OFFICE would be a very powerful tool in assessing the human actions through commerce.
Satsuki Shizuka make that a suggestion
I like this idea
This suggestion has been implemented as part of the new economy statistics in Update 14.2.