NetHunt links all the future emails you receive/send having installed the system.
The old emails cannot be linked to your records automatically as it may crush the servers (imagine you have 50 users and each of them has a long history of client communication that should be linked).
You can choose which emails you need to link to relevant records and bulk link them to a relevant record.
For example, you type into the search bar the email address of the client, it gives you the list of those emails and you choose all of them (or a part) and bulk link them to a record:
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