HubSpot Sales is able to track emails by embedding a 1x1 pixel, invisible image into a message once it is sent. When the user views the email and the images load, we are able to display that open to you.
You can receive real-time notifications if you are using the HubSpot Sales extension for Google Chrome or the HubSpot Sales Outlook tray app. You can also view your notifications at any time within your activity stream.
You must have Google Chrome running on your computer with the HubSpot Sales extension enabled or the HubSpot Sales for Windows Outlook tray app in order to receive real-time notifications. Here is an example of each type of real time notification that is sent by HubSpot Sales:
An email is opened
A link is clicked
A HubSpot website visit
Viewing your activity stream
All of your notifications can also be found in your activity stream. You can access your activity stream by clicking on the extension in Google Chrome or, from within your CRM, by clicking on Sales Tools > Notifications.