Filtering

Truly goes to great lengths to ensure that sensitive emails do not make it into the CRM. The first step in the sync logic is to discard any emails that are either not tied to a potential customer or that may have dangerous content

By default, Truly disregards any email that is completely internal (eg: all participants are in the same email domain). This eliminates the possibility of logging sensitive emails to Salesforce even if a user creates a test contact/lead with their own email (or someone else's email).

A user's inbox is generally composed of several key structures/folders that contain email that a user wouldn't want to be synced. That's why Truly discards any emails that aren't in the Primary Inbox or Sent folders (all other messages are discarded, just like internal emails)