Gmail uses the "Sender:" line to show which Gmail account you're sending from regardless of how you've configured your "From:" or "Reply-To:" lines. Just in case anyone cares about your Gmail account. But why should they, unless you're dealing in kiddie p0rn?
So why do Outlook, Outlook Express, Lotus Notes, etc. think they should take the "Sender:" line and treat it as your "From:" line or your "Reply-To:" line instead? RFC822 doesn't tell them to do that. Hate.
