Is there a way I can get the From field value, when I send the email?

using the ItemSend when i send the email, i can check the to, subject etc.
using Item.To, Item.Subject etc. but I can't read the From value. I would
need to check if that's empty (like normally when sending from my mailbox) or
if it has something in it (normally when I send email from resource mailbox),
and based on which one, I run the code before it send the email.

Any way to check this?

Thanks!