I'm trying to create a cgi script that will send mail to a certain address, appearing to be from another address (one a user types into a form).
I can do this using sendmail thusly: 
sendmail ('god@heaven.com', 'die.puny@earthling.net', 'Test', 'This is
+ a test');

sub sendmail {
    my ($from, $to, $subject, $body) = @_;

    open(MAIL, "|/usr/lib/sendmail -oem -t -oi -f $from");
    print MAIL "To: $to\n";
    print MAIL "Subject: $subject\n\n";
    print MAIL "$body\n";
    close MAIL;
}

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Which works fine. However, attempting to do this with Mail::Mailer, results in the mail appearing to come from www-data. 
sendmail ('god@heaven.com', 'die.puny@earthling.net', 'Test', 'This is
+ a test');

sub sendmail {
    my ($from, $to, $subject, $body) = @_;

    my $mailer;
    eval {
        $mailer = Mail::Mailer->new();
    };
    if ($@) {
    warn "Couldn't send mail: $@";
    } else {
        $mailer->open({ From     => $from,
                        To       => $to,
                        Subject  => $subject });
        print $mailer $body;
        unless (close ($mailer)) {
            warn "Couldn't close mailer: $!";
        }
    }
}

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I've read all the documentation I've been able to lay my hands on (Mail::Mailer's is rather minimal), and done a Super Search, but all to no avail.
So, fellow monks, is there any way of forcing the 'From:' field using Mail::Mailer?

[Btw, I'm using exim as my MTA, and www-data is listed in trusted_users]

In reply to Changing the 'From:' header with Mail::Mailer by kilinrax

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