Quickbase lets you send a single email message to several users specified in your Billing Account.
To send a single email message to several users at one time:
If you go to the Account Summary section of the Admin Console, you can click More in the top-right corner and select Email Users.
Click More in the top-right corner and click Email Users
Select an option (Users with access to specific apps, All app managers, All app admins, or All users with access) and click Download file, to download a file with those email addresses, then paste the list into your email program.