We try to review and approve campaigns as soon as possible. Typically, the Campaigns review team checks to ensure there is no spam content and that your sender address comes from a private domain (e.g., @yourcompany.com) and not a public one (e.g., @gmail.com). Usually, this may take from 15 to 30 minutes. Once your campaign is sent out, you'll be notified via an email and by a message that can be viewed on the Notification section (the bell icon) of your Campaigns' account.  Learn more about why your email campaign is being reviewed.