info associated with a sender's name

[JT]

First I open an e-mail sent to me by someone within the
company. Next I right click on the sender's name. A menu
is displayed. One of the items on the menu is "Office:
1234".

1234 is a code for the sender's home office.

Is there a way for me to programmatically (1) open the e-
mail, (2) right click on the sender's name, and (3)
retrieve the home office code?

I can select specific e-mails so that is not an issue.

I would prefer not to open the e-mail but will do so if
necessary.

I'm stuck on the right click and retrieving the home
office code.

Any help in would be greatly appreciated. Thanks