formail syntax?

1)  cat ~/mail/test | formail -xFrom:
2)  FROM=`formail -xFrom:`

How come, when I perform command #1, I get only the From: header, but
when I use syntax #2 in my procmailrc script, the variable contains
the From (w/o colon) header?  For my current purposes, I want the
From: header (with colon), so I thought my procmailrc would work, but
obviously I'm not getting my desired results.

Thanks,
Scott
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