As a part of Request management, e-mail notifications help us notify users on important occurrences in a request. ServiceDesk Plus has default email notifications however we cannot have these notifications sent based on conditions. You might even need these notifications to go to a bunch of users. I hope this post helps you achieve this in the simplest way.
In earlier versions, script-based custom triggers provided flexibility to send out custom notifications based on conditions.
With version 10.0, we have enhanced custom trigger to send out custom notifications without script dependency. This provides the versatility to choose the users to be notified and customize an email notification from the user interface itself.
Do utilize this feature and share us your feedback.. Cheers!