Send messages to multiple candidates, using the bulk action bar!
First start off by enabling Bulk (1) and then select the candidates you want to send the message to (2). Select the candidates you want to reach out to and click Message (3).
Send email
When setting up the message you have the option of using a Message template or writing the message from scratch. At the bottom, you can attach files and/or questions you want to include.
Once you are happy with the message, click Send and it will be sent as an email to the selected candidates.
Send SMS
If you have activated the Add-on feature for SMS, you will have the option to SMS several candidates at once. More on that here.