Bloomz allows you to send a message to the entire class, all parents in your class, a few parents, or a single parent.

Check out these resources for step-by-step instructions on how to send a message: 

Messaging My Class/ Group

Messaging My Contacts

Can I send private message to more than one person?

Can I message all parents at the same time?
Can I message parents privately?

Can a parent message to teacher privately