my $mail;
$template->process('mail.tt', $vars, \$mail) || die "Template problem!";

my $mime = MIME::Lite->new(
    From     => 'abc@xyz.com',
    To       => 'you@yours.com',
    Subject  => 'Test',
    Type     => 'text/html',
    Date     =>  $mail,
);
$mime->send;