Return E-mail address in Outlook

Hi,

I am trying to read the return e-mailaddress from a MailItem in the Outlook
inbox.
However, all I can come up with, is SenderName.
I've tried to lookup the address in the following interfaces:
- UserProperties
- ReplyRecipients
But with both the Count property contains 0.

Could someone please tell me how I can get the return e-mail address from a
MailItem?

Thanks in advance!
Bas