If you're using the HubSpot Sales email extension to track your emails, you may occasionally receive a notification that 'Someone' opened or clicked your email.
This notification may occur in the following situations:
If you send a tracked email to multiple email addresses (including CC and BCC), you will likely see a Someone notification instead of a specific recipient. When you send an email to multiple recipients, they all receive the same HubSpot Sales tracking image. HubSpot Sales will still notify you of the email open, but it won't be possible to determine exactly which recipient opened the email.