Comparing this to Yesware which is much better (but paid). Hubspot Sales is okay. Testing with another email account, I notice it does not keep track of reopens well. Push notifications do not work properly. Sometimes you dont an email has been opened until you happen to be checking the app which may defeat the purpose if someone is trying to catch email recipients while theyre cognizant of the email. Okay for a free service but wanted to include these details just so you know!