wp-login.php hacked?

My server sent me this message but I have no idea why or what the uploaed code does. I’m not aware of any changes being made:

Below are the recently upload scripts that contain code to send email. You may wish to inspect them to ensure they are not sending out SPAM.

/home/esinem/public_html/wp-login.php:244: 	if ( $message && !wp_mail($user_email, $title, $message) )
/home/esinem/public_html/wp-login.php:245: 		wp_die( __('The e-mail could not be sent.') . "\n" . __('Possible reason: your host may have disabled the mail() function...') );
/home/esinem/public_html/wp-login.php:246:

Can anyone tell me what’s going on here?