[python-win32] sending mail and "From" field

[dukE]

Hi guys,
I'm using win32com.client, microsoft outlook and Mapi session. 
Eerything's fine, but i can't send message as someone else. I mean 
there's no option to fill "From" field. When i use Outlook there's such 
field and I'm wondering how can i fill it.

Thx for any suggestions