You can send a test email to members of your team before sending the email to its recipients.
Create an Email Invite or an Attendee Update just as you would normally. Choose a "Send At" date and time for the future to give yourself time to test the email. Once you've saved your Email, you should see it in the Email Overview page. Select your email to see a summary. Below the email summary are the options to "Test Email" and to "Preview".
Select "Test Email" and a modal will appear, asking you to enter the name or email address of your Message Blocks team member(s). Click "Send" when you are ready to send your test email.