Mailbox is an internal messaging system that allows you to send notes to other Spark users in the web app. Click Mailbox in the top-right corner of the page to get started!
In the Compose Message section, click the To: link to select the user that you wish to message.
Enter your Subject and Message, then click Send Message.
Your Inbox and Sent Messages folders are available on the left-side navigation bar. You can also create additional folders as needed.