It might be worth using the debug option:

MIME::Lite->send( $method, $host, Timeout=>$timeout, Debug=>1 );
[download]

This will print any errors to STDERR. Since I'm not sure where this will go on a web server so it's probably best to redirect STDERR to a file in this case. You can find out more about this here: How do I redirect STDOUT, STDIN, or STDERR to a FILE?