Hi,
Yes we changed it to work with Home page title in current version.
If it's not acceptable for you - you can change it in code or ask our team to make this small change:
open includes/classes/rlMail.class.php
find function replaceVariables and make following change in the function
Code:
Only registered members can view the code.
change to
Code:
Only registered members can view the code.
then login to the admin panel and through Languages manager add phrase with key 'new_site_name' and title you want to use as phrase text