If you use the Apollo extension to track emails, it may create Placeholder Profiles in Apollo.
A Placeholder Profile is a profile that Apollo creates when you send a message outside of Apollo to an email that isn't assocaited with a saved contact. This occurs when you enable the Track checkbox on emails that you send through Gmail.
When no existing contacts match the email address to which you have sent a tracked email, Apollo creates a Placeholder Profile to avoid cluttering your database.
Please note, Placeholder Profiles do not represent contacts in the Apollo database. This means that you cannot use the Apollo Search feature to find these email addresses.
To find a Placeholder Profile for a tracked email address, launch Apollo, hover your mouse over Engage in the navbar, and then click Emails.
Click the Filter icon to expand the available filters.
Type the email address into the Search bar.
Click the name associated with the email.
You can now view the Placeholder Profile associated with the tracked email address.
Please note, Apollo does not create Placeholder Profiles for existing contacts. If you send a message outside of Apollo to an email that belongs to an existing contact, Apollo always associates the message with the contact's profile in Apollo. This happens regardless of whether you have installed the Apollo Chrome Extension or not. For more information about how to add a contact to Apollo, please refer to the "Save Contacts and Accounts" article.