I figured it out. It had to do with my MDA (Mail Delivery Agent). qmail sets environment variables that tells the MDA what the "MAIL FROM" line was. But, my MDA (maildrop) does not read the environment variables, so that the data doesn't get saved in my Maildir.
It was a matter of changing my .qmail file from: |/usr/local/bin/maildrop to: |/var/qmail/bin/preline -f /usr/local/bin/maildrop
