In the 12.0. version of Pipeliner CRM we have introduced the option to automatically track an e-mail as an Activity. To do so follow the steps below.
1. Open Contact detail
2. Click on the envelope icon next to the e-mail address
3. Select the option "YES"
4. A new task will be created with automatically pre-filled Subject, it will be automatically linked to the Contact, once done click Save.