Which field must a document have to meet minimum threading requirements?

For a document to meet minimum threading requirements, it must include the Email From field. This essential element provides the identity of the sender, which is critical for establishing a thread of communication. The Email From field helps to link multiple emails together based on who initiated the communication.

In threading, the context of the conversation is often defined by the participants, and knowing who sent which message is a pivotal part of that context. While other fields like Email Subject, Email To, and Email CC may also contribute to understanding the flow of communication, the Email From field serves as the primary key for identifying the sender and hence is fundamental to achieving a proper threading structure.